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Loop seen as a trivial knot
mathematical theory of knots, the unknot, not knot, or trivial knot, is the least knotted of all knots. Intuitively, the unknot is a closed loop of rope without
Unknot
Mathematical invariant of a knot or link
polynomial is characterized by taking the value 1 on any diagram of the unknot and satisfies the following skein relation: ( t 1 / 2 − t − 1 / 2 ) V (
Jones_polynomial
Simplest non-trivial closed knot with three crossings
distinguishes the trefoil from the unknot. The simplest such invariant is tricolorability: the trefoil is tricolorable, but the unknot is not. In addition, virtually
Trefoil_knot
Study of mathematical knots
are joined so it cannot be undone, the simplest knot being a ring (or "unknot"). In mathematical language, a knot is an embedding of a circle in 3-dimensional
Knot_theory
Unique knot with a crossing number of four
it the knot with the third-smallest possible crossing number, after the unknot and the trefoil knot. The figure-eight knot is a prime knot. The name is
Figure-eight knot (mathematics)
Figure-eight_knot_(mathematics)
Type of closed polygonal chain
mathematics, a stuck unknot is a closed polygonal chain in three-dimensional space (a skew polygon) that is topologically equal to the unknot but cannot be deformed
Stuck_unknot
Knot which lies on the surface of a torus in 3-dimensional space
of components is gcd(p, q)). A torus knot is trivial (equivalent to the unknot) if and only if either p or q is equal to 1 or −1. The simplest nontrivial
Torus_knot
Prime knot named for John Horton Conway
property of having the same Alexander polynomial and Conway polynomial as the unknot. The issue of the sliceness of the Conway knot was resolved in 2020 by Lisa
Conway_knot
Operation combining two oriented knots
simplest knot, called the unknot or trivial knot, is a round circle embedded in R3. In the ordinary sense of the word, the unknot is not "knotted" at all
Knot_(mathematics)
Orientable surface whose boundary is a knot or link
as well. The standard Möbius strip has the unknot for a boundary but is not a Seifert surface for the unknot because it is not orientable. The "checkerboard"
Seifert_surface
Invariant of mathematical knots
Khovanov Homology (like the instanton knot Floer homology) detects the unknot. Khovanov homology is related to the representation theory of the Lie algebra
Khovanov_homology
Determining whether a knot is the unknot
Unsolved problem in mathematics Can unknots be recognized in polynomial time? More unsolved problems in mathematics In mathematics, the unknotting problem
Unknotting_problem
Three-dimensional smooth curves with small total curvature must be unknotted
less than or equal to 4π, then K is an unknot, i.e.: If ∮ K | κ ( s ) | d s ≤ 4 π , then K is an unknot . {\displaystyle {\text{If}}\ \oint _{K}|\kappa
Fáry–Milnor_theorem
Property in knot theory
distinguish between two different (non-isotopic) knots. In particular, since the unknot is not tricolorable, any tricolorable knot is necessarily nontrivial. In
Tricolorability
Knot invariant
For example, this shows immediately that the Alexander polynomial of the unknot is 1 (though this follows also immediately from the definition). The Alexander
Alexander_polynomial
Family of mathematical knots
the ends together. (That is, a twist knot is any Whitehead double of an unknot.) The twist knots are an infinite family of knots, and are considered the
Twist_knot
Continuous deformation between two continuous functions
embeddings. However, this definition would make every knot equivalent to the unknot, as the knotted portions can be "contracted" down to a straight line. The
Homotopy
One of three types of isotopy-preserving local changes to a knot diagram
number of Reidemeister moves required to change a diagram of the unknot to the standard unknot. In detail, for any such diagram with c {\displaystyle c} crossings
Reidemeister_move
Polynomials arising in knot theory
using skein relations: P ( u n k n o t ) = 1 , {\displaystyle P(\mathrm {unknot} )=1,\,} ℓ P ( L + ) + ℓ − 1 P ( L − ) + m P ( L 0 ) = 0 , {\displaystyle
HOMFLY_polynomial
Type of knot
(King Crimson album) knotwork (Discipline Global Mobile logo) Endless knot (unknot) Eternity knot Fan knot Fiador knot Flat mat knot Flores button knot Friendship
Decorative_knot
Type of mathematical knot
3 ∖ V {\displaystyle S^{3}\setminus V} is a tubular neighbourhood of an unknot J {\displaystyle J} . The 2-component link K ′ ∪ J {\displaystyle K'\cup
Satellite_knot
Bacterial enzyme
further negative supercoiling like the latter enzyme. Topoisomerase IV can unknot right-handed knots and decatenate right-handed catenanes without acting
Topoisomerase_IV
Specific knot in knot theory with 11 crossings
shares a Jones polynomial. It has the same Alexander polynomial as the unknot. Weisstein, Eric W. "Conway's Knot". mathworld.wolfram.com. Retrieved 2020-05-19
Kinoshita–Terasaka_knot
Mathematical tool for studying knots
first diagram is two unknots with four crossings. Patching the latter P() = A × P() + P() gives, again, a trefoil, and two unknots with two crossings (the
Skein_relation
2023 EP by Tatsuya Kitani
limited edition includes the DVD of the live performance of the one-man tour "Unknot/Reknot" held at Zepp DiverCity (Tokyo) on October 15, 2022. On June 26,
Where_Our_Blue_Is
Link that consists of finitely many unlinked unknots
the plane. The two-component unlink, consisting of two non-interlinked unknots, is the simplest possible unlink. An n-component link L ⊂ S3 is an unlink
Unlink
Mathematical notation for describing the structure of knots
Halverson, James; Ruehle, Fabian; Sułkowsk, Piotr (2021). "Learning to unknot". Machine Learning: Science and Technology. IOPscience. doi:10.1088/2632-2153/abe91f
Dowker–Thistlethwaite notation
Dowker–Thistlethwaite_notation
least two, so the knots that minimize the bridge number (other than the unknot) are the 2-bridge knots. It can be shown that every n-bridge knot can be
Bridge_number
Collection of knots that do not intersect, but may be linked
one component is called the Hopf link, which consists of two circles (or unknots) linked together once. The circles in the Borromean rings are collectively
Link_(knot_theory)
Integer-valued knot invariant; least number of crossings in a knot diagram
any diagram of the knot. It is a knot invariant. By way of example, the unknot has crossing number zero, the trefoil knot three and the figure-eight knot
Crossing_number_(knot_theory)
complement of an alternating knot,[L04] and a proof that every diagram of the unknot can be transformed into a diagram without crossings by only a polynomial
Marc_Lackenby
Fundamental group of a knot complement
computed in the Wirtinger presentation by a relatively simple algorithm. The unknot has knot group isomorphic to Z. The trefoil knot has knot group isomorphic
Knot_group
Conjecture in knot theory relating quantum invariants and hyperbolic geometry
knots to the hyperbolic geometry of their complements. Let O denote the unknot. For any knot K {\displaystyle K} , let ⟨ K ⟩ N {\displaystyle \langle K\rangle
Volume_conjecture
conjectures in stable homotopy theory to be resolved. Unknotting problem: can unknots be recognized in polynomial time? Volume conjecture relating quantum invariants
List of unsolved problems in mathematics
List_of_unsolved_problems_in_mathematics
links. See also list of knots, list of geometric topology topics. 01 knot/Unknot - a simple un-knotted closed loop 31 knot/Trefoil knot - (2,3)-torus knot
List of mathematical knots and links
List_of_mathematical_knots_and_links
Heraldic knot
The Bowen knot is an unknot design used as a heraldic charge. It is named after the Welshman James Bowen (died 1629) and is also called the true lover's
Bowen_knot
Complement of a knot in three-sphere
complement of the unknot is homeomorphic to a solid torus - notice that while the unknot itself can be represented as a torus, the hole in the unknot corresponds
Knot_complement
Function of a knot that takes the same value for equivalent knots
knots from each other. However, there are invariants which distinguish the unknot from all other knots, such as Khovanov homology and knot Floer homology
Knot_invariant
Concept in topology
In R 3 {\displaystyle \mathbb {R} ^{3}} , the unknot is not ambient-isotopic to the trefoil knot since one cannot be deformed into the other through a
Ambient_isotopy
Property of an object that is not congruent to its mirror image
its mirror image, otherwise it is called a chiral knot. For example, the unknot and the figure-eight knot are achiral, whereas the trefoil knot is chiral
Chirality_(mathematics)
Polynomial invariant of framed links
=1} , where ◯ {\displaystyle \bigcirc } is the standard diagram of the unknot ⟨ ◯ ⊔ L ⟩ = ( − A 2 − A − 2 ) ⟨ L ⟩ {\displaystyle \langle \bigcirc \sqcup
Bracket_polynomial
Two-variable polynomial knot invariant
the following properties: L ( O ) = 1 {\displaystyle L(O)=1} (O is the unknot). L ( s r ) = a L ( s ) , L ( s ℓ ) = a − 1 L ( s ) . {\displaystyle L(s_{r})=aL(s)
Kauffman_polynomial
Smallest number of edges of an equivalent polygonal path for a knot
number of 6. The upper bound on the stick number does not apply to the unknot, which has crossing number 0 but stick number 3. Knots can be drawn with
Stick_number
Mathematical representation
{\displaystyle {\frac {1-t}{1-t^{n}}}\det(I-f_{*})=1,} and the closure of f* is the unknot whose Alexander polynomial is 1. The first nonfaithful Burau representations
Burau_representation
Interlinked multi-loop construction where cutting one loop frees all the others
simplest possible Brunnian link is the Borromean rings, a link of three unknots. However for every number three or above, there are an infinite number
Brunnian_link
Mathematical theory
curve can be classified as a trefoil knot. If the ends are connected to other points on the sphere, the curve may be an unknot (green) or a trefoil (red).
Open_knot_theory
Attempt to classify and tabulate all possible knots
correctness of its results. Both counts found 1701936 prime knots (including the unknot) with up to 16 crossings. Most recently, in 2020, Benjamin Burton classified
Knot_tabulation
Type of invariant in Knot theory
Vassiliev invariants, is a complete knot invariant, or even if it detects the unknot. Computation of the Kontsevich integral, which has values in an algebra
Finite_type_invariant
Branch of mathematics studying (smooth) functions of manifolds
theory, requires 2+1 dimensions. Roughly, the Whitney trick allows one to "unknot" knotted spheres – more precisely, remove self-intersections of immersions;
Geometric_topology
Every knot or link can be represented as a closed braid
rings (63 2) L10a140 Satellite Composite knots Granny Square Knot sum Torus Unknot (01) Trefoil (31) Cinquefoil (51) Septafoil (71) Unlink (02 1) Hopf (22
Alexander's_theorem
Sequence of moves on a lattice
length of a randomly chosen SAP increases, the probability of finding an unknot decreases exponentially, implying that the probability of a self-avoiding
Self-avoiding_walk
Group whose operation is a composition of braids
rings (63 2) L10a140 Satellite Composite knots Granny Square Knot sum Torus Unknot (01) Trefoil (31) Cinquefoil (51) Septafoil (71) Unlink (02 1) Hopf (22
Braid_group
Type of planar curve with tree-like structure
crossing have been erased), the tree-like curves can only be shadows of the unknot. As knot diagrams, these represent connected sums of figure-eight curves
Tree-like_curve
Minimum number of times a specific knot must be passed through itself to become untied
{\displaystyle n} , then there exists a diagram of the knot which can be changed to unknot by switching n {\displaystyle n} crossings. The unknotting number of a knot
Unknotting_number
Prime knot with crossing number 10
rings (63 2) L10a140 Satellite Composite knots Granny Square Knot sum Torus Unknot (01) Trefoil (31) Cinquefoil (51) Septafoil (71) Unlink (02 1) Hopf (22
Perko_pair
Knot that bounds an embedded disk in 4-space
rings (63 2) L10a140 Satellite Composite knots Granny Square Knot sum Torus Unknot (01) Trefoil (31) Cinquefoil (51) Septafoil (71) Unlink (02 1) Hopf (22
Slice_knot
link and its tunnels forms a Heegaard splitting of the link exterior. The unknot is the only knot with tunnel number 0. The trefoil knot has tunnel number
Tunnel_number
knot having the same Alexander polynomial and Conway polynomial as the unknot Conway notation (knot theory) – a notation invented by Conway for describing
List of things named after John Horton Conway
List_of_things_named_after_John_Horton_Conway
Theorem in topology
not simply-connected. The conjecture states that all knots, except the unknot, have Property P. Research on Property P was started by R. H. Bing, who
Property_P_conjecture
Mathematician specializing in knot theory
Thistlethwaite unknot
Morwen_Thistlethwaite
American poet
(ISBN 0-8048-0644-6). This book includes Zen texts, but also the Vijnana Bhairava Tantra Unknot The World In You. His second book, which published through Sequoia University
Paul_Reps
Analog of the knot group
{\displaystyle F_{n}} , as the link group of a single link is the knot group of the unknot, which is the integers, and the link group of an unlinked union is the free
Link_group
Difference in shape from a mirror image
into its mirror image, otherwise it is called chiral. For example, the unknot and the figure-eight knot are achiral, whereas the trefoil knot is chiral
Chirality
Particular knot energy
understand how hard this problem really is. The special case of recognizing the unknot, called the unknotting problem, is of particular interest. We shall picture
Möbius_energy
Way to join two given mathematical manifolds together
shrink until it is very small and then pulling it along the other knot. The unknot is the unit. The two trefoil knots are the simplest prime knots. Higher-dimensional
Connected_sum
Operation on a knot producing a link with two components
The Bing double of a knot K is defined by placing the Bing double of the unknot in the solid torus surrounding it, as shown in the figure, and then twisting
Bing_double
Type of mathematical knot
rings (63 2) L10a140 Satellite Composite knots Granny Square Knot sum Torus Unknot (01) Trefoil (31) Cinquefoil (51) Septafoil (71) Unlink (02 1) Hopf (22
(−2,3,7)_pretzel_knot
Operation used to modify three-dimensional topological spaces
surgery. If M {\displaystyle M} is the 3-sphere, L {\displaystyle L} is the unknot, and the surgery coefficient is 0 {\displaystyle 0} , then the surgered
Dehn_surgery
Heraldic knot
The Dacre knot, a type of decorative unknot, is a heraldic knot used primarily in English heraldry. It is most notable for its appearance on the Dacre
Dacre_knot
Two interlinked loops with five structural crossings
crossing of the figure-eight. The above-below relation between these two unknots is then set as an alternating link, with the consecutive crossings on each
Whitehead_link
Mathematical knot with crossing number 7
rings (63 2) L10a140 Satellite Composite knots Granny Square Knot sum Torus Unknot (01) Trefoil (31) Cinquefoil (51) Septafoil (71) Unlink (02 1) Hopf (22
7_2_knot
Three linked but pairwise separated rings
Nelson (2013), "Forming the Borromean rings out of arbitrary polygonal unknots", Journal of Knot Theory and Its Ramifications, 22 (14): 1350083, 15, arXiv:1406
Borromean_rings
Incorrect but seminal physical theory
kind of knot. The simple toroidal vortex, represented by the circular "unknot" 01, was thought to represent hydrogen. Many elements had yet to be discovered
Vortex_theory_of_the_atom
Knot that can't be tied in a string of constant diameter
rings (63 2) L10a140 Satellite Composite knots Granny Square Knot sum Torus Unknot (01) Trefoil (31) Cinquefoil (51) Septafoil (71) Unlink (02 1) Hopf (22
Wild_knot
Knot invariant named after Cahit Arf
finite sequence of pass-moves. Every knot is pass-equivalent to either the unknot or the trefoil; these two knots are not pass-equivalent and additionally
Arf_invariant_of_a_knot
Encyclopedic website dedicated to knot theory
rings (63 2) L10a140 Satellite Composite knots Granny Square Knot sum Torus Unknot (01) Trefoil (31) Cinquefoil (51) Septafoil (71) Unlink (02 1) Hopf (22
The_Knot_Atlas
Invariant property of protein molecules
theory is limited to a small percentage of proteins as most of them are unknot. Circuit topology categorises intra-chain contacts based on their arrangements
Protein_topology
Link formed from a finite number of twisted sections
non-invertible knot. The (2p, 2q, 2r) pretzel link is a link formed by three linked unknots. The (−3, 0, −3) pretzel knot (square knot (mathematics)) is the connected
Pretzel_link
Statistical model used in machine learning
one can pick up a polygon from a desk and flip it around in 3-space, or unknot a knot in 4-space), yielding the "augmented neural ODE". Any homeomorphism
Flow-based_generative_model
Non-trivial knot which cannot be written as the knot sum of two non-trivial knots
A chart of all prime knots with seven or fewer crossings, not including mirror-images, plus the unknot (which is not considered prime).
Prime_knot
Specific element of an algebraic structure
\nleftrightarrow } (nonequivalence) ⊥ {\textstyle \bot } (falsity) Knots Knot sum Unknot Compact surfaces # (connected sum) S2 Abstract groups Direct product Trivial
Identity_element
Method of fastening or securing linear material
numbers are different for the trefoil knot, the figure-eight knot, and the unknot (a simple loop), showing that one cannot be moved into the other (without
Knot
Mathematical knot with crossing number 7
rings (63 2) L10a140 Satellite Composite knots Granny Square Knot sum Torus Unknot (01) Trefoil (31) Cinquefoil (51) Septafoil (71) Unlink (02 1) Hopf (22
74_knot
Proteins with backbone entangled in a knot
Mansfield proposed in 1994, that there can be knots in proteins. He gave unknot scores to proteins by constructing a sphere centered at the center of mass
Knotted_protein
Invariant of a knot diagram
rings (63 2) L10a140 Satellite Composite knots Granny Square Knot sum Torus Unknot (01) Trefoil (31) Cinquefoil (51) Septafoil (71) Unlink (02 1) Hopf (22
Writhe
2013 Indian film by Ritesh Batra
rating, stating "A well-told old-fashioned romance, The Lunchbox gracefully unknots the trials, tribulations, fears and hopes of everyday people sans the glamour
The_Lunchbox
British mathematician (born 1963)
knots which was used in their proof that Khovanov homology detects the unknot. Besides his research articles, his writings include a book, with Simon
Peter_B._Kronheimer
Computational complexity class
The unknotting problem, recognizing whether a knot diagram describes the unknot, announced by Marc Lackenby in 2021. Quasi-polynomial time has also been
Quasi-polynomial_time
American mathematician
Kronheimer, P. B.; Mrowka, T. S. (February 11, 2011). "Khovanov homology is an unknot-detector". Publications Mathématiques de l'IHÉS. 113 (1): 97–208. arXiv:1005
Tomasz_Mrowka
Mathematical knot
{\displaystyle F_{t}} is exactly K {\displaystyle K} . For example: The unknot, trefoil knot, and figure-eight knot are fibered knots. The Hopf link is
Fibered_knot
Generalization of knots in 3-dimensional Euclidean space
rings (63 2) L10a140 Satellite Composite knots Granny Square Knot sum Torus Unknot (01) Trefoil (31) Cinquefoil (51) Septafoil (71) Unlink (02 1) Hopf (22
Virtual_knot
{\displaystyle \chi } is the Euler characteristic. The crosscap number of the unknot is zero, as the Euler characteristic of the disk is one. The crosscap number
Crosscap_number
Property of knots in mathematics
(smooth) slice genus is zero if and only if the knot is concordant to the unknot. Slice knot knot genus Milnor conjecture (topology) Rudolph, Lee (1997)
Slice_genus
Dutch heraldic knot
The Hinckaert knot, a type of decorative unknot, is a heraldic knot used primarily in Dutch heraldry. It is most notable for its appearance on the Hinckaert
Hinckaert_knot
Theorem that the diffeomorphism group of the 3-sphere has the homotopy-type of O(4)
equivalent statements of the Smale conjecture. One is that the component of the unknot in the space of smooth embeddings of the circle in 3-space has the homotopy-type
Smale_conjecture
variety of heraldic knot Bowen knot (heraldic knot) – not a true knot (an unknot), a continuous loop of rope laid out as an upright square shape with loops
List_of_knots
French architect
Preciado. Roche describes s/he and New Territories as "tool to knot and unknot realities" in the spirit of Michel Foucault. The Frac Centre-Val de Loire
François_Roche
2π times turning number of a curve
knot is an invariant of the knot. This invariant has the value 2π for the unknot, but by the Fáry–Milnor theorem it is at least 4π for any other knot. Chen
Total_curvature
American painter
2022. "James Siena". Yale School of Art. Retrieved 7 July 2022. "Nested Unknots, 2004, James Siena". Universal Limited Art Editions (ULAE). Retrieved 12
James_Siena
Canadian computer scientist (1944–2019)
motion planning, visualization (computer graphics), knot theory (stuck unknot problem), linkage (mechanical) reconfiguration, the art gallery problem
Godfried_Toussaint
UNKNOT
UNKNOT
UNKNOT
UNKNOT
Girl/Female
Australian, German, Greek, Hawaiian, Hebrew
Voice of the Lord; Delightful; Sweet
Girl/Female
English
Good elf.
Girl/Female
Muslim
Aware, Knowing
Boy/Male
Greek American English
Rock.
Biblical
he is my God himself
Girl/Female
Hindu, Indian, Kannada, Malayalam, Marathi, Tamil, Telugu
Full-fill; Prosperous
Male
English
Wood Carver
Boy/Male
Arabic, Muslim
A Great Sahabi who Participated in the Battle of Badr
Surname or Lastname
English and Dutch
English and Dutch : variant spelling of Burger.
Girl/Female
Tamil
Raga in hindustani classical music
UNKNOT
UNKNOT
UNKNOT
UNKNOT
UNKNOT
v. t.
To free from knots; to untie.