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MATHWORLD

  • MathWorld
  • Online mathematics reference work

    MathWorld is an online mathematics reference work, created and largely written by Eric W. Weisstein. It is sponsored by and licensed to Wolfram Research

    MathWorld

    MathWorld

  • 6
  • Natural number

    Intelligence Service, MI6. Six degrees (disambiguation). Weisstein, Eric W. "6". mathworld.wolfram.com. Retrieved 2020-08-03. Higgins, Peter (2008). Number Story:

    6

    6

  • Delta (letter)
  • Fourth letter in the Greek alphabet

    Eric W. "Triangle Area". mathworld.wolfram.com. Retrieved 2025-01-23. Weisstein, Eric W. "Symmetric Difference". mathworld.wolfram.com. Retrieved 2025-01-31

    Delta (letter)

    Delta_(letter)

  • Omega
  • Last letter of the Greek alphabet

    Eric W. "Omega Constant". mathworld.wolfram.com. Retrieved 18 January 2025. Weisstein, Eric W. "Brocard Points". mathworld.wolfram.com. Retrieved 7 February

    Omega

    Omega

  • Eric W. Weisstein
  • American mathematician and encyclopedist (born 1969)

    mathematician, and encyclopedist who created and maintains the encyclopedias MathWorld and ScienceWorld. In addition, he is the author of the CRC Concise Encyclopedia

    Eric W. Weisstein

    Eric_W._Weisstein

  • 8
  • Natural number

    divisors Weisstein, Eric W. "Octal". mathworld.wolfram.com. Retrieved 7 August 2020. Weisstein, Eric W. "Octagon". mathworld.wolfram.com. Retrieved 7 August

    8

    8

  • 7
  • Natural number

    2016-06-01. Weisstein, Eric W. "Heptagon". mathworld.wolfram.com. Retrieved 2020-08-25. Weisstein, Eric W. "7". mathworld.wolfram.com. Retrieved 2020-08-07. Cohen

    7

    7

  • Gamma
  • Third letter of the Greek alphabet

    W. "Hermite Constants". mathworld.wolfram.com. Retrieved 2025-01-31. Weisstein, Eric W. "Euler-Mascheroni Constant". mathworld.wolfram.com. Retrieved 2025-01-23

    Gamma

    Gamma

  • 20 (number)
  • Natural number

    Weisstein, Eric W. "Icosahedron". mathworld.wolfram.com. Retrieved 2020-08-16. Weisstein, Eric W. "Dodecahedron". mathworld.wolfram.com. Retrieved 2020-08-16

    20 (number)

    20_(number)

  • Rho
  • Seventeenth letter of the Greek alphabet

    Eric W. "Spectral Radius". mathworld.wolfram.com. Retrieved 2025-01-22. Weisstein, Eric W. "Plastic Constant". mathworld.wolfram.com. Retrieved 2025-01-31

    Rho

    Rho

  • List of mathematical constants
  • MathWorld. Weisstein, Eric W. "Polygon Inscribing". MathWorld. Weisstein, Eric W. "Wallis's Constant". MathWorld. Weisstein, Eric W. "e". MathWorld.

    List of mathematical constants

    List_of_mathematical_constants

  • 2
  • Natural number

    ISBN 978-0-691-15822-8. Weisstein, Eric W. "Digon." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Digon.html "Polygons on the Sphere". sites

    2

    2

  • Psi (Greek)
  • Penultimate letter in the Greek alphabet

    "Reciprocal Fibonacci Constant". mathworld.wolfram.com. Retrieved 2025-02-01. Weisstein, Eric W. "Chebyshev Functions". mathworld.wolfram.com. Retrieved 2025-02-01

    Psi (Greek)

    Psi (Greek)

    Psi_(Greek)

  • List of spirals
  • Weisstein, Eric W. "Cornu Spiral". mathworld.wolfram.com. Retrieved 2023-11-22. Weisstein, Eric W. "Fresnel Integrals". mathworld.wolfram.com. Retrieved 2023-01-31

    List of spirals

    List_of_spirals

  • 10
  • Natural number

    called a decagon. Mathematics portal Weisstein, Eric W. "Happy Number". mathworld.wolfram.com. Retrieved 2025-04-25. N. J. A. Sloane. "A005278: Noncototients"

    10

    10

  • Tau
  • Nineteenth letter in the Greek alphabet

    Function". mathworld.wolfram.com. Archived from the original on 29 Jun 2017. Retrieved 28 Oct 2017. Weisstein, Eric W. "Tau Function". mathworld.wolfram

    Tau

    Tau

  • Greek letters used in mathematics, science, and engineering
  • Symbols for constants, special functions

    Eric W. "Kronecker Delta". mathworld.wolfram.com. Retrieved 2025-01-23. Weisstein, Eric W. "Feigenbaum Constant". mathworld.wolfram.com. Retrieved 2025-01-23

    Greek letters used in mathematics, science, and engineering

    Greek_letters_used_in_mathematics,_science,_and_engineering

  • Theta
  • Eighth letter of the Greek alphabet

    ISBN 978-0-521-63751-0. θ Theta voiceless dental fricative Weisstein, Eric W. "Angle". mathworld.wolfram.com. Retrieved 2025-02-01. Elert, Glenn (2023), "Special Symbols"

    Theta

    Theta

  • Sigma
  • Eighteenth letter of the Greek alphabet

    Eric W. "Sigma". mathworld.wolfram.com. Retrieved 25 January 2025. Weisstein, Eric W. "Sigma-Compact Topological Space". mathworld.wolfram.com. Retrieved

    Sigma

    Sigma

  • 278 (number)
  • Natural number

    On-Line Encyclopedia of Integer Sequences. OEIS Foundation. "Nontotient numbers". mathworld.wolfram.com. "Semiprime numbers". mathworld.wolfram.com. v t e

    278 (number)

    278_(number)

  • Circle
  • Simple curve of Euclidean geometry

    2007 (orig. 1952). Incircle – from Wolfram MathWorld Archived 2012-01-21 at the Wayback Machine. Mathworld.wolfram.com (2012-04-26). Retrieved on 2012-05-03

    Circle

    Circle

    Circle

  • Operation (mathematics)
  • Addition, multiplication, division, ...

    Eric W. "Unary Operation". MathWorld. Weisstein, Eric W. "Binary Operation". MathWorld. Weisstein, Eric W. "Vector". MathWorld. "Vectors can be added together

    Operation (mathematics)

    Operation (mathematics)

    Operation_(mathematics)

  • Plus and minus signs
  • Mathematical symbols (+ and −)

    models, including the TI-81 and TI-82 Weisstein, Eric W. "Subtraction". mathworld.wolfram.com. Archived from the original on 2020-09-14. Retrieved 2020-08-26

    Plus and minus signs

    Plus_and_minus_signs

  • Epsilon
  • Fifth letter of the Greek alphabet

    Weisstein, Eric W. "Limit". mathworld.wolfram.com. Retrieved 30 January 2025. Weisstein, Eric W. "Permutation Symbol". mathworld.wolfram.com. Retrieved 24

    Epsilon

    Epsilon

  • Gini coefficient
  • Measure of inequality of a statistical distribution

    {\displaystyle 2\Phi (0)-1=2(0.5)-1} = 0. "Wolfram MathWorld: The Web's Most Extensive Mathematics Resource". mathworld.wolfram.com. Retrieved 30 November 2022.

    Gini coefficient

    Gini coefficient

    Gini_coefficient

  • Mu (letter)
  • Twelfth letter of the Greek alphabet

    degree of membership of X in A. Weisstein, Eric W. "Möbius Function". mathworld.wolfram.com. Retrieved 2025-01-24. "DLMF: §27.2 Functions ‣ Multiplicative

    Mu (letter)

    Mu (letter)

    Mu_(letter)

  • Unit circle
  • Circle with radius of one

    Weisstein, Eric W. "Unit Circle". mathworld.wolfram.com. Retrieved 2020-05-05. Weisstein, Eric W. "Hypersphere". mathworld.wolfram.com. Retrieved 2020-05-06

    Unit circle

    Unit circle

    Unit_circle

  • 274 (number)
  • Natural number

    cycles. "Composite numbers". mathworld.wolfram.com. "proper divisors". mathworld.wolfram.com. "Tribonacci numbers". mathworld.wolfram.com. "Stirling number

    274 (number)

    274_(number)

  • 268 (number)
  • Natural number

    and 137. "Facts about the integer". mathworld.wolfram.com. "Untouchable numbers". mathworld.wolfram.com. "Twin prime numbers". mathworld.wolfram.com.

    268 (number)

    268_(number)

  • Jean Gaston Darboux
  • French mathematician (1842–1917)

    Wolfram MathWorld at mathworld.wolfram.com Darboux Problem -- from Wolfram MathWorld at mathworld.wolfram.com Goursat Problem -- from Wolfram MathWorld at

    Jean Gaston Darboux

    Jean Gaston Darboux

    Jean_Gaston_Darboux

  • Pi
  • Number, approximately 3.14

    "Circle". MathWorld. Bronshteĭn & Semendiaev 1971, pp. 200, 209. Weisstein, Eric W. "Circumference". MathWorld. Weisstein, Eric W. "Ellipse". MathWorld. Martini

    Pi

    Pi

  • 0
  • Number

    handwritten manuscript) Zero on In Our Time at the BBC Weisstein, Eric W. "0". MathWorld. Texts on Wikisource: "Zero". Encyclopædia Britannica (11th ed.). 1911

    0

    0

  • Parallelogram
  • Quadrilateral with two pairs of parallel sides

    World. Weisstein, Eric W. "Parallelogram." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/Parallelogram.html Mitchell, Douglas

    Parallelogram

    Parallelogram

    Parallelogram

  • Aleph number
  • Infinite cardinal number

    Hypothesis". Wolfram Mathworld. Wolfram Web Resources. Retrieved 15 August 2018. Weisstein, Eric W. "Continuum Hypothesis". mathworld.wolfram.com. Retrieved

    Aleph number

    Aleph number

    Aleph_number

  • Full width at half maximum
  • Concept in statistics and wave theory

    1037C. General Services Administration. Archived from the original on 2022-01-22. Gaussian Function – from Wolfram MathWorld FWHM at Wolfram Mathworld

    Full width at half maximum

    Full width at half maximum

    Full_width_at_half_maximum

  • Spheroid
  • Surface formed by rotating an ellipse

    ISBN 9783110170726. "Oblate Spheroid". Wolfram MathWorld. Retrieved 24 June 2014. "Prolate Spheroid". Wolfram MathWorld. 7 October 2003. Retrieved 24 June 2014

    Spheroid

    Spheroid

    Spheroid

  • Pi (letter)
  • Greek letter

    symbol looks like the Greek letter pi (π). Weisstein, Eric W. "Product". mathworld.wolfram.com. Retrieved 2025-01-18. "13.7: Osmotic Pressure". Chemistry

    Pi (letter)

    Pi_(letter)

  • Zeta
  • Sixth letter in the Greek alphabet

    Γραμματική (~100 BCE). . Weisstein, Eric W. "Riemann Zeta Function". mathworld.wolfram.com. Retrieved 2025-01-22. "DLMF: Chapter 25 Zeta and Related

    Zeta

    Zeta

  • Vertex (geometry)
  • Point where two or more curves, lines, or edges meet

    Weisstein, Eric W. "Polygon Vertex". MathWorld. Weisstein, Eric W. "Polyhedron Vertex". MathWorld. Weisstein, Eric W. "Principal Vertex". MathWorld.

    Vertex (geometry)

    Vertex_(geometry)

  • 265 (number)
  • Natural number

    integer". mathworld.wolfram.com. "Proper divisors of 265". numbermatics.com. "Derangement sequence". mathworld.wolfram.com. "Vescica Piscis". mathworld.wolfram

    265 (number)

    265_(number)

  • Division sign
  • Mathematical symbol

    Company. pp. 242, 270–271. pp 270,271 Weisstein, Eric W. "Division". mathworld.wolfram.com. Retrieved 2020-08-26. "Division". www.mathsisfun.com. Retrieved

    Division sign

    Division_sign

  • 282 (number)
  • Natural number

    about the integer". mathworld.wolfram.com. "Palindromic numbers". mathworld.wolfram.com. "Proper divisor information". mathworld.wolfram.com. "Planar

    282 (number)

    282_(number)

  • Division (mathematics)
  • Arithmetic operation

    Thom & Company. Weisstein, Eric W. "Division". MathWorld. Weisstein, Eric W. "Division by Zero". MathWorld. Derbyshire, John (2004). Prime Obsession: Bernhard

    Division (mathematics)

    Division (mathematics)

    Division_(mathematics)

  • 11 (number)
  • Natural number

    Foundation. Retrieved 2023-01-22. Weisstein, Eric W. "Brocard's Problem". MathWorld. Retrieved 24 July 2025. Mueller, Francis J. (1965). "More on Pascal's

    11 (number)

    11_(number)

  • 89 (number)
  • Natural number

    2016-05-29. Weisstein, Eric W. "196-Algorithm." From MathWorld, a Wolfram Web Resource. http://mathworld.wolfram.com/196-Algorithm.html "Prime Curios! 89"

    89 (number)

    89_(number)

  • Elementary cellular automaton
  • Mathematics concept

    Automaton". MathWorld. Weisstein, Eric W. "Rule 30". MathWorld. Weisstein, Eric W. "Rule 50". MathWorld. Weisstein, Eric W. "Rule 54". MathWorld. Weisstein

    Elementary cellular automaton

    Elementary cellular automaton

    Elementary_cellular_automaton

  • Great circle
  • Spherical geometry analog of a straight line

    ellipse Rhumb line W., Weisstein, Eric. "Great Circle -- from Wolfram MathWorld". mathworld.wolfram.com. Retrieved 2022-09-30.{{cite web}}: CS1 maint: multiple

    Great circle

    Great circle

    Great_circle

  • Numerical digit
  • Symbols used to write numbers

    MathWorld. Weisstein, Eric W. "Palindromic Number". mathworld.wolfram.com. Retrieved 22 July 2020. Weisstein, Eric W. "Lychrel Number". mathworld.wolfram

    Numerical digit

    Numerical_digit

  • Cartesian coordinate system
  • Coordinate system using perpendicular axes

    Cartesian Coordinate System Weisstein, Eric W. "Cartesian Coordinates". MathWorld. Coordinate Converter – converts between polar, Cartesian and spherical

    Cartesian coordinate system

    Cartesian coordinate system

    Cartesian_coordinate_system

  • Subset
  • Set whose elements all belong to another set

    (PDF) on 2013-01-23, retrieved 2012-09-07 Weisstein, Eric W. "Subset". mathworld.wolfram.com. Retrieved 2020-08-23. Jech, Thomas (2002). Set Theory. Springer-Verlag

    Subset

    Subset

    Subset

  • Tilde
  • Punctuation and accent mark (~, ◌̃)

    Diccionario de la lengua española, Real Academia Española "Tilde". Wolfram/MathWorld. 3 November 2011. Archived from the original on 5 September 2015. Retrieved

    Tilde

    Tilde

  • 360 (number)
  • Natural number

    OEIS Foundation. Retrieved 2023-11-02. "Centered Triangular Number". mathworld.wolfram.com. Sloane, N. J. A. (ed.). "Sequence A062786 (Centered 10-gonal

    360 (number)

    360 (number)

    360_(number)

  • Pentagram
  • Five-pointed star polygon

    Pentagram. Wikimedia Commons has media related to Pentagrams. Weisstein, Eric W. "Pentagram". MathWorld. The Pythagorean Pentacle from the Biblioteca Arcana.

    Pentagram

    Pentagram

    Pentagram

  • Cone
  • Geometric shape

    Weisstein, Eric W. "Cone". MathWorld. Weisstein, Eric W. "Double Cone". MathWorld. Weisstein, Eric W. "Generalized Cone". MathWorld. An interactive Spinning

    Cone

    Cone

    Cone

  • Kappa
  • Tenth letter in the Greek Alphabet

    Eric W. "Vertex Connectivity". mathworld.wolfram.com. Retrieved 2025-02-05. Weisstein, Eric W. "Curvature". mathworld.wolfram.com. Retrieved 2025-02-05

    Kappa

    Kappa

    Kappa

  • Isohedral figure
  • Generalisation of dice with identical faces

    Weisstein, Eric W. "Isozonohedron". mathworld.wolfram.com. Retrieved 2019-12-26. Weisstein, Eric W. "Isohedron". mathworld.wolfram.com. Retrieved 2019-12-21

    Isohedral figure

    Isohedral figure

    Isohedral_figure

  • Map projection
  • Systematic representation of the surface of a sphere or ellipsoid onto a plane

    MathWorld. Weisstein, Eric W. "Azimuthal Equidistant Projection". MathWorld. Weisstein, Eric W. "Lambert Azimuthal Equal-Area Projection". MathWorld.

    Map projection

    Map projection

    Map_projection

  • Rhombicosidodecahedron
  • Archimedean solid with 62 faces

    (page 123) Weisstein, Eric W. "Icosahedral group". MathWorld. Weisstein, Eric W. "Zome". MathWorld. Read, R. C.; Wilson, R. J. (1998), An Atlas of Graphs

    Rhombicosidodecahedron

    Rhombicosidodecahedron

    Rhombicosidodecahedron

  • Solid angle
  • Measure in 3-dimensional geometry

    from Wolfram MathWorld". Mathworld.wolfram.com. 2015-10-19. Retrieved 2015-10-19. "Spherical Excess – from Wolfram MathWorld". Mathworld.wolfram.com.

    Solid angle

    Solid angle

    Solid_angle

  • Gamma function
  • Extension of the factorial function

    doi:10.1093/qmath/12.1.283. Weisstein, Eric W. "Bohr–Mollerup Theorem". MathWorld. Davis, Philip. "Leonhard Euler's Integral: A Historical Profile of the

    Gamma function

    Gamma function

    Gamma_function

  • Maximum and minimum
  • Largest and smallest value taken by a function at a given point

    Weisstein, Eric W. "Minimum". mathworld.wolfram.com. Retrieved 2020-08-30. Weisstein, Eric W. "Maximum". mathworld.wolfram.com. Retrieved 2020-08-30

    Maximum and minimum

    Maximum and minimum

    Maximum_and_minimum

  • 303 (number)
  • Natural number

    Encyclopedia of Integer Sequences. OEIS Foundation. "Bipartite graphs". mathworld.wolfram.com. Salvatore, Jimmy. "Biparite Graphs and Problem Solving" (PDF)

    303 (number)

    303_(number)

  • 302 (number)
  • Natural number

    even number where phi(x)=302 has no answers. "Facts about the integer". mathworld.wolfram.com. Sloane, N. J. A. (ed.). "Sequence A000607 (Number of partitions

    302 (number)

    302_(number)

  • If and only if
  • Logical connective

    ISBN 978-0-13-238034-8. Weisstein, Eric W. "Iff." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/Iff.html Archived 13 November 2018 at

    If and only if

    If_and_only_if

  • List of trigonometric identities
  • "Half-Angle Formulas". MathWorld. Abramowitz and Stegun, p. 72, 4.3.24–26 Weisstein, Eric W. "Double-Angle Formulas". MathWorld. Abramowitz and Stegun

    List of trigonometric identities

    List of trigonometric identities

    List_of_trigonometric_identities

  • Area
  • Size of a two-dimensional surface

    numbers. Used in anglophone countries. Weisstein, Eric W. "Area". Wolfram MathWorld. Archived from the original on 5 May 2012. Retrieved 3 July 2012. "Area

    Area

    Area

    Area

  • Identity matrix
  • Square matrix with ones on the main diagonal and zeros elsewhere

    Weisstein, Eric W. "Unit Matrix". mathworld.wolfram.com. Retrieved 2021-05-05. Weisstein, Eric W. "Identity Matrix". mathworld.wolfram.com. Retrieved 2020-08-14

    Identity matrix

    Identity matrix

    Identity_matrix

  • Ball
  • Round object

    INTERPRETATIONS 2023 EDITION" (PDF). Weisstein, Eric W. "Lemon Surface". mathworld.wolfram.com. Retrieved October 31, 2024. "The Canadian Amateur Rule Book

    Ball

    Ball

    Ball

  • Heart symbol
  • Symbol representing the heart

    foetida)". Weisstein, Eric W., "Cardioid" from MathWorld. Eric W. Weisstein, "Heart Curve." From MathWorld Martin Kemp, "The Heart" in Christ to Coke: How

    Heart symbol

    Heart symbol

    Heart_symbol

  • Googolplex
  • Number ten to the power of a googol

    definition of googolplex at Wiktionary Weisstein, Eric W. "Googolplex". MathWorld. Haran, Brady (17 February 2012). "Googol and Googolplex". Numberphile

    Googolplex

    Googolplex

  • Mercator projection
  • Cylindrical conformal map projection

    of the globe. See great-circle distance, the Vincenty's formulae, or Mathworld. Needham, Joseph (1959). Science and Civilization in China. Vol. 3. Cambridge

    Mercator projection

    Mercator projection

    Mercator_projection

  • CRC Press
  • American publishing group

    which in 2004 became part of the UK publisher Informa. Chapman & Hall MathWorld "Auerbach Publications". Archived from the original on 10 March 2020.

    CRC Press

    CRC_Press

  • 285 (number)
  • Natural number

    "Composite numbers". mathworld.wolfram.com. "Square pyramidal number sequence". marhworld.wolfram.com. "Binary rooted tree". mathworld.wolfram.com. Sloane

    285 (number)

    285_(number)

  • Number
  • Used to count, measure, and label

    1414. doi:10.3390/math8091414. Weisstein, Eric W. "Goldbach Conjecture". MathWorld–A Wolfram Resource. Archived from the original on 1 November 2025. Retrieved

    Number

    Number

    Number

  • Lozenge (shape)
  • Quadrilateral with sides of equal length

    English Dictionary for Advanced Learners. "Lozenge - from Wolfram MathWorld". Mathworld.wolfram.com. 2015-07-22. Retrieved 2015-08-11. Welters, Linda (1999)

    Lozenge (shape)

    Lozenge_(shape)

  • Chi (letter)
  • Twenty-second letter of the Greek alphabet

    W. "Euler Characteristic". mathworld.wolfram.com. Retrieved 2025-02-09. Weisstein, Eric W. "Chromatic Number". mathworld.wolfram.com. Retrieved 2025-02-09

    Chi (letter)

    Chi_(letter)

  • 286 (number)
  • Natural number

    Sequences. OEIS Foundation. "Tetrahedral numbers". mathworld.wolfram.com. "Sphenic numbers". mathworld.wolfram.com. Sloane, N. J. A. (ed.). "Sequence A130433

    286 (number)

    286_(number)

  • Lissajous curve
  • Mathematical curve outputted from a specific pair of parametric equations

    projects Definitions from Wiktionary Media from Commons Lissajous Curve at Mathworld 3D Java applets depicting the construction of Lissajous curves in an oscilloscope:

    Lissajous curve

    Lissajous curve

    Lissajous_curve

  • Sierpiński curve
  • Recursively defined sequence of continuous closed plane fractal curves

    (computer science) Sierpiński triangle Weisstein, Eric W. "Sierpiński Curve". MathWorld. Retrieved 21 January 2019. Dickau, Robert M. (1996/7)"Two-dimensional

    Sierpiński curve

    Sierpiński curve

    Sierpiński_curve

  • My Wife and My Mother-in-Law
  • Ambiguous image, first published in 1888

    Retrieved 9 October 2011. Weisstein, Eric W. "Young Girl-Old Woman Illusion". MathWorld. Retrieved 9 October 2011. Botwinick, Jack (June 1961). "Husband and Father-in-Law—A

    My Wife and My Mother-in-Law

    My Wife and My Mother-in-Law

    My_Wife_and_My_Mother-in-Law

  • Graham's number
  • Large number coined by Ronald Graham

    (sequence A240162 in the OEIS) Weisstein, Eric W. "Graham's Number". Wolfram Mathworld. Retrieved 2026-04-24. "Graham's number records". Iteror.org. Archived

    Graham's number

    Graham's_number

  • Closure (mathematics)
  • Operation on the subsets of a set

    Eric W. "Transitive Closure". mathworld.wolfram.com. Retrieved 2020-07-25. Weisstein, Eric W. "Algebraic Closure". mathworld.wolfram.com. Retrieved 2020-07-25

    Closure (mathematics)

    Closure_(mathematics)

  • Coordinate system
  • Method for specifying point positions

    Woods p. 1 Weisstein, Eric W. "Coordinate System". MathWorld. Weisstein, Eric W. "Coordinates". MathWorld. Stewart, James B.; Redlin, Lothar; Watson, Saleem

    Coordinate system

    Coordinate system

    Coordinate_system

  • Tessellation
  • Covering by shapes without overlaps or gaps

    Publications, 1973, ISBN 978-0-486-61480-9. Weisstein, Eric W. "Tessellation". MathWorld. Emmer, Michele; Schattschneider, Doris (8 May 2007). M.C. Escher's Legacy:

    Tessellation

    Tessellation

    Tessellation

  • 36 (number)
  • Natural number

    Weisstein, Eric W. "36 Officer Problem". MathWorld. Retrieved 2020-08-21. Weisstein, Eric W. "Archimedean Solid". MathWorld. Retrieved 2020-08-21. Weisstein,

    36 (number)

    36_(number)

  • Proportionality (mathematics)
  • Property of two varying quantities with a constant ratio

    MathWorld – A Wolfram Web Resource. "Inverse variation". math.net. Retrieved October 31, 2021. Weisstein, Eric W. "Inversely Proportional". MathWorld

    Proportionality (mathematics)

    Proportionality (mathematics)

    Proportionality_(mathematics)

  • Spiral
  • Curve that winds around a central point

    Eric W. "Archimedean Spiral". mathworld.wolfram.com. Retrieved 2020-10-08. Weisstein, Eric W. "Hyperbolic Spiral". mathworld.wolfram.com. Retrieved 2020-10-08

    Spiral

    Spiral

    Spiral

  • Statistical population
  • Complete set of items that share at least one property in common

    ISBN 978-1-4419-2850-4. ISSN 0172-7397. Weisstein, Eric W. "Statistical population". MathWorld. Yates, Daniel S.; Moore, David S.; Starnes, Daren S. (2003). The Practice

    Statistical population

    Statistical_population

  • Mathematician
  • Person with an extensive knowledge of mathematics

    mathematicians, living or dead. Weisstein, Eric W. "Unsolved Problems". MathWorld. Middle School Mathematician Project Short biographies of select mathematicians

    Mathematician

    Mathematician

    Mathematician

  • Mathematical coincidence
  • Coincidence in mathematics

    \pi ^{2}} so close to 10?" (PDF). Mathworld, Pi Approximations, Line 47 Weisstein, Eric W. "Almost Integer". MathWorld. Bailey, David; Borwein, Jonathan;

    Mathematical coincidence

    Mathematical_coincidence

  • Smarandache–Wellin number
  • Concatenation of the first n prime numbers

    MathWorld. Retrieved 2011-07-28. Weisstein, Eric W. "Smarandache–Wellin number". MathWorld. Weisstein, Eric W. "Smarandache–Wellin prime". MathWorld.

    Smarandache–Wellin number

    Smarandache–Wellin_number

  • 22 (number)
  • Natural number

    Foundation. Retrieved 2022-07-21. Weisstein, Eric W. "Mathieu Groups". mathworld.wolfram.com. Retrieved 2022-07-02. Coxeter, H.S.M. (1991), Regular Complex

    22 (number)

    22_(number)

  • Sport of athletics
  • Group of sporting events

    Archived from the original on 2019-04-28. Retrieved 2022-08-23. "Stadium". mathworld.wolfram.com. Archived from the original on 9 September 2021. Retrieved

    Sport of athletics

    Sport of athletics

    Sport_of_athletics

  • Rational number
  • Quotient of two integers

    Retrieved 2020-08-11. Weisstein, Eric W. "Rational Number". Wolfram MathWorld. Retrieved 2020-08-11. Gilbert, Jimmie; Linda, Gilbert (2005). Elements

    Rational number

    Rational number

    Rational_number

  • Angle of incidence (optics)
  • Angle in geometric optics

    Vocabulary (in Japanese). Retrieved 2025-12-26. Weisstein, Eric W. "Angle of incidence". MathWorld. geometry: rebound on the strip billiards Flash animation

    Angle of incidence (optics)

    Angle_of_incidence_(optics)

  • Inequality (mathematics)
  • Mathematical relation making a non-equal comparison

    Weisstein, Eric W. "Much Less". mathworld.wolfram.com. Retrieved 2019-12-03. Weisstein, Eric W. "Much Greater". mathworld.wolfram.com. Retrieved 2019-12-03

    Inequality (mathematics)

    Inequality (mathematics)

    Inequality_(mathematics)

  • Mersenne prime
  • Prime number of the form 2^n – 1

    htm Archived 2016-02-02 at the Wayback Machine Weisstein, Eric W. "Mersenne number". MathWorld. Weisstein, Eric W. "Mersenne prime". MathWorld.

    Mersenne prime

    Mersenne_prime

  • 307 (number)
  • Natural number

    \mathbb {Q} ({\sqrt {-n}})} has class number 3. "Prime number information". mathworld.wolfram.com. Sloane, N. J. A. (ed.). "Sequence A007510 (Single (or isolated

    307 (number)

    307_(number)

  • Knight's tour
  • Mathematical problem set on a chessboard

    Desika". Bridge-India. Retrieved 2019-10-16. A History of Chess by Murray "MathWorld News: There Are No Magic Knight's Tours on the Chessboard". Allen J. Schwenk

    Knight's tour

    Knight's tour

    Knight's_tour

  • Mathematical constant
  • Fixed number that has received a name

    2007-11-27. Weisstein, Eric W. "Grossman's constant". MathWorld. Weisstein, Eric W. "Foias' constant". MathWorld. Edward Kasner and James R. Newman (1989). Mathematics

    Mathematical constant

    Mathematical_constant

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Online names & meanings

  • RANNULF
  • Male

    German

    RANNULF

    Frankish German form of Old Norse Ránulfr, RANNULF means "plundering wolf."

  • Qaaid
  • Boy/Male

    Arabic, Muslim

    Qaaid

    Variant of Qa'id; Steersman; Leader

  • PIERINA
  • Female

    Italian

    PIERINA

    Pet form of Italian Piera, PIERINA means "rock, stone."

  • Mohanram
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    Indian, Tamil

    Mohanram

    Charming

  • Zahera
  • Girl/Female

    Afghan, Arabic, Australian

    Zahera

    Flower; Proud; Beautiful; Strong

  • Titsworth
  • Surname or Lastname

    English

    Titsworth

    English : habitational name from Tetsworth in Oxfordshire, from an unattested Old English personal name Tǣtel + Old English worth ‘enclosure’.

  • Ni'mat
  • Girl/Female

    Arabic, Muslim

    Ni'mat

    Blessings; Loans

  • Paartha
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    Hindu, Indian, Sanskrit

    Paartha

    Arjuna; Son of Pritha

  • Jaihasini | ஜைஹாஸீநீ
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    Tamil

    Jaihasini | ஜைஹாஸீநீ

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    Australian, British, English

    Baylea

    Bailiff; Sherriff's Officer; From the Outer Castle Wall Meadow

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