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Search references for CLASS NUMBER. Phrases containing CLASS NUMBER
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Topics referred to by the same term
mathematics, class number may refer to Class number (group theory), in group theory, is the number of conjugacy classes of a group Class number (number theory)
Class_number
Listing all imaginary quadratic fields with a given class number
In mathematics, the Gauss class number problem (for imaginary quadratic fields), as usually understood, is to provide for each n ≥ 1 a complete list of
Class_number_problem
Formula in number theory
In number theory, the class number formula relates many important invariants of an algebraic number field to a special value of its Dedekind zeta function
Class_number_formula
number fields with class number 1. It is believed that there are infinitely many such number fields, but this has not been proven. The class number of
List of number fields with class number one
List_of_number_fields_with_class_number_one
In number theory, measure of non-unique factorization
In mathematics, the ideal class group (or class group) of an algebraic number field K {\displaystyle K} is the quotient group J K / P K {\displaystyle
Ideal_class_group
In group theory, equivalence class under the relation of conjugation
conjugacy class of a . {\displaystyle a.} The class number of G {\displaystyle G} is the number of distinct (nonequivalent) conjugacy classes. Conjugacy
Conjugacy_class
Japanese planned class of battleships
The Number 13-class battleship was a planned class of four fast battleships to be built for the Imperial Japanese Navy (IJN) during the 1920s. The ships
Number_13-class_battleship
In mathematics, the Hurwitz class number H(N), introduced by Adolf Hurwitz, is a modification of the class number of positive definite binary quadratic
Hurwitz_class_number
Generalization of "n-th" to infinite cases
(α + 1)-th number class is the cardinality immediately following that of the α-th number class. For a limit ordinal α, the α-th number class is the union
Ordinal_number
Linguistic category of nouns
In linguistics, a noun class is a particular category of nouns. A noun may belong to a given class because of the characteristic features of its referent
Noun_class
Natural number
23 is the smallest discriminant of imaginary quadratic fields with class number 3 (negated), and it is the smallest discriminant of complex cubic fields
23_(number)
Natural number
quadratic field of class number two, where 163 is the largest such (Heegner) number of class one. 427 number is also the first number to hold a sum-of-divisors
21_(number)
Finite extension of the rationals
K {\displaystyle K} has class number 1. Given a number field, the class number is often difficult to compute. The class number problem, going back to Gauss
Algebraic_number_field
Concept in algebraic number theory
quadratic field Q ( − d ) {\displaystyle \mathbb {Q} ({\sqrt {-d}})} has class number 1. Equivalently, the ring of algebraic integers of Q ( − d ) {\displaystyle
Heegner_number
Library classification system
numbers for main classes, with fractional decimals allowing expansion for further detail. A library assigns a classification number that unambiguously
Dewey_Decimal_Classification
Natural number
smallest prime number p for which the real quadratic field Q[√p] has class number greater than 1 (namely 3). A cousin prime with 83. An emirp in base 10
79_(number)
Set of topological invariants
particular in algebraic topology and differential geometry, the Stiefel–Whitney classes are a set of topological invariants of a real vector bundle that describe
Stiefel–Whitney_class
Used to count, measure, and label
natural numbers can be represented by classes of equivalent sets. For instance, the number 3 can be represented as the class of all sets that have exactly three
Number
Natural number
cyclotomic field Q ( ζ n ) {\displaystyle \mathrm {Q} (\zeta _{n})} has class number 1 {\displaystyle 1} (or unique factorization), preceding 60 (that is
84_(number)
Branch of number theory
group in algebraic geometry). The number of elements in the class group is called the class number of K. The class number of Q(√-5) is 2. This means that
Algebraic_number_theory
Natural number
fifth discriminant of imaginary quadratic fields with class number 5, where the 131st prime number 739 is the fifteenth such discriminant. Meanwhile, there
131_(number)
number (or prime) is a natural number greater than 1 that has no divisors other than 1 and itself. By Euclid's theorem, there are an infinite number of
List_of_prime_numbers
French general purpose stealth frigates
The La Fayette class (also known as FL-3000 for "Frégate Légère de 3,000 tonnes", or FLF for Frégate Légère Furtive) is a class of general purpose frigates
La_Fayette-class_frigate
Quadratic homogeneous polynomial in two variables
in quadratic fields. This allows the class number of a quadratic field to be calculated by counting the number of reduced binary quadratic forms of a
Binary_quadratic_form
Natural number
the imaginary quadratic field Q(√–d) has class number = 11. Wikimedia Commons has media related to 167 (number). Prime curiosities: 167 Sloane, N. J. A
167_(number)
Characteristic class for real vector bundles
the Pontryagin classes, named after Lev Pontryagin, are certain characteristic classes of real vector bundles. The Pontryagin classes lie in cohomology
Pontryagin_class
Social class
social class system composed of working class and middle class (with the exception of a small number of wealthy billionaires). The American upper class is
Upper_class
Natural number
of imaginary quadratic fields with class number of 7, negated (see also Heegner numbers). 71 is the largest number which occurs as a prime factor of an
71_(number)
Pattern-recognition performance metrics
a class is the number of true positives (i.e. the number of items correctly labelled as belonging to the positive class) divided by the total number of
Precision_and_recall
Registry number for locomotives and multiple units
Digits 5–8 are a four-digit class number, 9–11 the three-digit serial number of the vehicle within its class. For class numbers for vehicles in the existing
UIC identification marking for tractive stock
UIC_identification_marking_for_tractive_stock
Characteristic classes of vector bundles
differential geometry and algebraic geometry, the Chern classes are characteristic classes associated with complex vector bundles. They have since become
Chern_class
West Germanic language
copula verb to be. The seven word classes are exemplified in this sample sentence: English nouns are only inflected for number and possession. New nouns can
English_language
Natural number
field Q ( − n ) {\displaystyle \mathbb {Q} ({\sqrt {-n}})} has class number 3. "Prime number information". mathworld.wolfram.com. Sloane, N. J. A. (ed.)
307_(number)
The Number 64 class (Chinese: 六十四號; pinyin: Liùshísì Hào), also known as the Monfalcone light cruisers or Monfalcone type light cruisers, was a planned
Number_64-class_cruiser
Proposed American battleship class
The Trump-class battleship is a proposed nuclear powered guided-missile warship for the United States Navy, announced by U.S. president Donald Trump in
Trump-class_battleship
Family of diesel and electric multiple units from Siemens
received the class number 460 by the Eisenbahnbundesamt, the federal railway authority (the unpowered middle carriages have the class number 860). The 15
Siemens_Desiro
Natural number
such that the imaginary quadratic field Q(√–d) has class number = 19. 4311 - 3311 is a prime number. For all integers n from 1 to 42, the value of 311
311_(number)
Part of the Kodaira classification
surfaces of class VII are non-algebraic complex surfaces studied by (Kodaira 1964, 1968) that have Kodaira dimension −∞ and first Betti number 1. Minimal
Surface_of_class_VII
Class of heavy cruisers built for the Royal Navy of the United Kingdom
The County class was a class of heavy cruisers built for the Royal Navy and Royal Australian Navy in the years between the First and Second World Wars
County-class_cruiser
Class of American 2-8-0 locomotive built for service overseas during World War II
become the FS Class 736 class. Algeria, Class 140-U – number unknown Morocco, Class 140-B – number unknown Tunisia, Class 140-250 – number unknown Mexico
USATC_S160_Class
Hitachi tri-mode train
Stubbings, David (17 March 2026). "Grand Central tweaks Cleethorpes plan - confirms class number of tri-mode sets". Rail Magazine. Retrieved 18 March 2026.
British_Rail_Class_820
Association of cohomology classes to principal bundles
of characteristic classes of total degree n with the fundamental class. The number of distinct characteristic numbers is the number of monomials of degree
Characteristic_class
Railway locomotive
starting with the 141 class. From the early 1970s onwards several locomotives of this class dropped the "B" prefix from their fleet number when re-liveried
CIÉ_121_Class
Class of an Irish rail trainset
number 22531–540,641,741,642,742,643,743,644,744,645,745. There have been attempts to improve the fuel economy of the 22000 Class. In 2008 the class were
IÉ_22000_Class
Class of 4-4-0 passenger tank locomotive
LSWR numbering policy, the number of the first locomotive of a new design became the number of the class. Since the first locomotive was numbered 46, the
LSWR_46_class
South African electric locomotive
receive this class number. The locomotive body is a welded monocoque design, constructed of steel plates and profiled members. The Class 22E locomotive
South_African_Class_22E
Field in algebraic number theory
In algebraic number theory, the Hilbert class field E {\displaystyle E} of a number field K {\displaystyle K} is the maximal abelian unramified extension
Hilbert_class_field
Natural number
happy number. 239 is the smallest positive integer d such that the imaginary quadratic field Q(√−d) has class number = 15. 239 is the smallest number that
239_(number)
Numbering and classification system
many sub-classes were redesignated to better align the locomotives to be numbered in that sub-class with the sub-class number. Thus, class 47 was originally
British Rail locomotive and multiple unit numbering and classification
British_Rail_locomotive_and_multiple_unit_numbering_and_classification
Function whose domain is the positive integers
function "expresses some arithmetical property of n". There is a larger class of number-theoretic functions that do not fit this definition, for example, the
Arithmetic_function
integer 1525 = heptagonal number, Mertens function zero 1526 = number of conjugacy classes in the alternating group A27 1527 = number of 2-dimensional partitions
1000_(number)
Class of Soviet diesel-electric patrol submarines
The Foxtrot class was the NATO reporting name of a class of diesel-electric patrol submarines that were built in the Soviet Union. The Soviet designation
Foxtrot-class_submarine
Grammatical number
linguistics, singulative number and collective number (abbreviated sgv and col) are terms used when the grammatical number for multiple items is the
Singulative_number
Freedom-class cruise ship, launched 2007
Independence of the Seas is a Freedom-class cruise ship operated by Royal Caribbean International. The 15-deck ship was built in the Aker Finnyards Turku
Independence_of_the_Seas
Natural number
(seven) is the natural number following 6 and preceding 8. It is the only prime number preceding a cube. As an early prime number in the series of positive
7
Class of US nuclear ballistic missile submarines
The Ohio class of nuclear-powered submarines includes the United States Navy's 14 ballistic missile submarines (SSBNs) and its 4 cruise missile submarines
Ohio-class_submarine
Study of numbers that are not solutions of polynomials with rational coefficients
and indeed it fails to detect that the number e is transcendental. But his work did provide a larger class of transcendental numbers, now known as Liouville
Transcendental_number_theory
Class of 3164 German 2-10-0 locomotives
class number now had to consist of 3 figures, the designations 051, 052 and 053 had to be introduced in addition to 050. As a result, the old Class 50
DRB_Class_50
Class of steam locomotives
Harry Wainwright to become B1 class. Twenty B Class engines were built by Neilson, Reid and Company and numbered 440-459. A further nine were built at the
SER_B_class
Designation for departmental locomotives
engineering duties. They were therefore of several different classes, lumped together for numbering purposes. Some locomotives were converted from redundant
British_Rail_Class_97
Class of midget submarine
expendable than Kilo-class attack submarines. He argues that the U.S. fleet is prone to a high threat environment created by sheer number of these "small but
Ghadir-class_submarine
the ideal class group. The ray class group is finite. Its order is the ray class number. The ray class number is divisible by the class number of K. Lang
Modulus (algebraic number theory)
Modulus_(algebraic_number_theory)
Dust-free room for research or production
number and size of particles permitted per volume of air. Large numbers like "class 100" or "class 1000" refer to FED-STD-209E, and denote the number
Cleanroom
United Nations code for dangerous substances
also receive different UN number Associated with each UN number is a hazard identifier, which encodes the general hazard class and subdivision (and, in
UN_number
Number
0 (zero, /ˈziː.roʊ/) is a number representing an empty quantity. Adding (or subtracting) 0 to any number leaves that number unchanged; in mathematical
0
Branch of algebraic number theory concerned with abelian extensions
In mathematics, class field theory (CFT) is the fundamental branch of algebraic number theory whose goal is to describe all the abelian Galois extensions
Class_field_theory
Subfield of number theory
a special case of the analytic class number formula, and in those terms reads that the Gaussian field has class number 1. The factor 1 4 {\displaystyle
Special_values_of_L-functions
Class of 55 two-cylinder 4-6-2 locomotives
The BR Standard Class 7, otherwise known as the Britannia Class, is a class of 4-6-2 "Pacific" type steam locomotive designed under Robert Riddles for
BR_Standard_Class_7
Natural number
the natural number following 11 and preceding 13. Twelve is the 3rd superior highly composite number, the 3rd colossally abundant number, the 5th highly
12_(number)
Natural number
A002854 (Number of unlabeled Euler graphs with n nodes; number of unlabeled two-graphs with n nodes; number of unlabeled switching classes of graphs
2000_(number)
Diesel-electric locomotives used by Philippine National Railways
4 digits, the numbering scheme for the new 900 class has three and seems to follow the numbering scheme of the Manila Railroad 800 class USA locomotives
PNR_900_class
Norwegian class of minesweepers
Alta class is a ship class of minesweepers operated by the Royal Norwegian Navy. An almost identical class of minehunters is known as the Oksøy class. The
Alta-class_minesweeper
remainder theorem class field The class field theory concerns abelian extensions of number fields. class number 1. The class number of a number field is the
Glossary_of_number_theory
Class of German shunting locomotives
the 5 Köf 11 prototypes) were given the class number 332, the 3 slower Köf 10 prototypes received class number 331; when the maximum speed was raised to
DB_Class_Köf_III
Class of 0-6-0 freight engines designed by Oliver Bulleid
produce a highly functional design. The class lasted in service until July 1966, and the first member of the class, number C1, has been preserved by the National
SR_Q1_class
Diesel-electric locomotives used by Philippine National Railways
The 5000 class or the GE U6B units feature number signs when they arrived in 1992, which are also found on the last batch of the 900 Class which consists
PNR_5000_class
Field (mathematics) generated by the square root of an integer
of binary quadratic forms. There remain some unsolved problems. The class number problem is particularly important. For a nonzero square free integer
Quadratic_field
Czech diesel motor coach class
repairs and additions that retain the class number, or large refurbishments such as ČD Class 814 or ZSSK Class 813, and have a second modernization since
ČSD_Class_M_152.0
Electric multiple unit train
BVG. BVB renumbered all trains that were sent to East Berlin with the class number "110": 1988: 2002/2003 to 2018/2019, 2022/2023 to 2052/2053 (when the
BVG_Class_D
Japanese type 2-6-0 steam locomotive
The JGR Class 7100 is a class of Japanese steam locomotive which was first used in Hokkaido, upon the establishment of the government-sponsored Horonai
JGR_Class_7100
British steam locomotives
development of Churchward's 4500 Class with larger side tanks and increased water capacity. 100 were built numbered 4575–4599 and 5500–5574. 15 (Nos.
GWR_4575_Class
Class of Polish electric locomotives
painted in the livery in February 2008. Szóstka ("The six") – from the class number Anglik ("Englishman") – from the country of origin Polish locomotives
PKP_class_EU06
Family of high-speed electric multiple unit trains
debuted on a class 408 train with line number 17. All subsequent units will be tout the redesigned seating. Like the Velaro D Class 407, the class 408 does
Siemens_Velaro
Norwegian navy ship class
The Oksøy-class mine hunters are a class of vessels of the Royal Norwegian Navy active since the mid-1990s. Almost identical to the Alta class, the only
Oksøy-class_mine_hunter
Hierarchical stratification of societies
common ones being: the working class, the middle class and the upper class. Membership of a social class is commonly considered dependent on education,
Social_class
Class of diesel locomotives used in Australia
The A class are a class of diesel locomotives rebuilt from Victorian Railways B class locomotives by Clyde Engineering, Rosewater in South Australia for
V/Line_A_class
Theorems whose content is effectively computable
theoretically incomplete included lower bounds for class numbers (ideal class groups for some families of number fields grow); and bounds for the best rational
Effective results in number theory
Effective_results_in_number_theory
British locomotive classification system
locomotives of the same class numbered in sequence. The GCR and GNoSR operated a strict policy of not permitting any gaps in the number series, nominally for
LNER locomotive numbering and classification
LNER_locomotive_numbering_and_classification
(later Class 219). The class number 219 was reused after the merger of Deutsche Bahn and the Deutsche Reichsbahn for the East German DR Class 119. In
DB_V_160_family
E Class Together with the letter representing the number of driving axles, a two-digit numeral following the letter indicates a class. The number distinguishes
Japan Railways locomotive numbering and classification
Japan_Railways_locomotive_numbering_and_classification
Class of Australian 4-4-0 locomotives
service but all retained their original NSWGR number. They were also reclassed as 'D'. In 1913 and 1914 the class had many problems with cracking gauge glasses
Commonwealth_Railways_D_class
Class of Australian 4-6-2 locomotives
The WAGR Ec class was a class of 4-6-2 heavy passenger and goods Vauclain compound locomotives operated by the Western Australian Government Railways
WAGR_Ec_class
U.S. guided-missile frigates under construction
The Constellation class of multi-mission guided-missile frigates of the United States Navy is based on the Italian Navy's version of the European multipurpose
Constellation-class_frigate
Class of diesel-electric multiple unit
TOPS in the late 1960s, the units were given the Class number 206. Because the Class 206 had no first class seating, their use was limited. As well as working
British_Rail_Class_206
Natural number
Ramsey classes of permutations. 5 is conjectured to be the only odd, untouchable number; if this is the case, then five will be the only odd prime number that
5
Diesel-electric locomotives used by Philippine National Railways
2500 class is a class of 43 GE U10B Diesel Electric Locomotives first introduced in 1965 with the delivery of the first 13 locomotives of the class. The
PNR_2500_class
Class of 285 Japanese 2-8-2 locomotives
September 2024 Japan Railways locomotive numbering and classification JNR Class 9600 JNR Class D50 JNR Class D51 "屋鋪要の保存蒸機撮りつぶし" [Yashiki Kaname's Preserved
JNR_Class_D52
Complexity class
computational complexity theory, the complexity class #P (pronounced "sharp P" or, sometimes "number P" or "hash P") is the set of the counting problems
♯P
Class of Indonesian diesel-hydraulic locomotives
(33 m/s). The earlier BB301 class number 01–45 was powered by a Maybach Mercedes-Benz 836B diesel engine, while the latter number 51–55 was powered by MTU
Indonesian Railways Class BB301
Indonesian_Railways_Class_BB301
class 600 engines were superheated, fitted with Caprotti valve gear and reclassified as class 625 machines between 1929 and 1933. Their class number changed
FS_Class_625
CLASS NUMBER
CLASS NUMBER
Boy/Male
English Latin Irish Welsh
Wealthy man.
Boy/Male
Australian, Dutch, German, Greek
People's Victory
Surname or Lastname
English
English : from the medieval female personal name Cass, a short form of Cassandra. This was the name (of uncertain, possibly non-Greek, origin) of an ill-fated Trojan prophetess of classical legend, condemned to foretell the future but never be believed; her story was well known and widely popular in medieval England.
Girl/Female
Indian
Glass
Girl/Female
Indian
Glass
Male
German
Short form of German Niclaus, CLAUS means "victor of the people."Â
Boy/Male
Arabic
Peace Maker; Brightness; Class
Girl/Female
Muslim/Islamic
Glass
Surname or Lastname
English
English : variant of Close 1.German : variant of Kloss.
Girl/Female
English
Cassandra was a Trojan prophetess, daughter of King Priam. A diminutive of Casirnir, Cassandra,...
Boy/Male
Greek Latin
People's victory.
Surname or Lastname
North German
North German : topographic name from Middle Low German plas ‘place’, ‘open square’, ‘street’.South German (also Pläss) : from a short form of the medieval personal name Blasius.English : variant of Place 3.
Girl/Female
Muslim
Glass
Surname or Lastname
English and German
English and German : metonymic occupational name for a glazier or glass blower, from Old English glæs ‘glass’ (akin to Glad, referring originally to the bright shine of the material), Middle High German glas.Irish and Scottish : Anglicized form of the epithet glas ‘gray’, ‘green’, ‘blue’ or any of various Gaelic surnames derived from it.German : altered form of the personal name Klass, a reduced form of Nikolaus (see Nicholas).Jewish (Ashkenazic) : ornamental name from German Glass ‘glass’, or a metonymic occupational name for a glazier or glass blower.
Female
English
English short form of Latin Cassandra, CASS means "she who entangles men."Â
Boy/Male
Australian, Danish, Dutch, Greek, Swedish
People of Victory; Victory of the People
Girl/Female
Tamil
Glass
Surname or Lastname
North German variant of Laas 2.Jewish (Ashkenazic)
North German variant of Laas 2.Jewish (Ashkenazic) : unexplained.English : nickname from Middle English lesse, lasse ‘smaller’ (from Old English lǣssa ‘less’), perhaps also used in the sense ‘younger’.
Surname or Lastname
English
English : nickname from Old French, Middle English cras ‘big’, ‘fat’ (Latin crassus).Possibly an altered spelling of German Krass.
Surname or Lastname
English
English : from the medieval personal name Classe, a short form of Nicholas. See also Clayson.Variant of Klaas or Klass, North German forms of Claus.
CLASS NUMBER
CLASS NUMBER
Girl/Female
Indian
Garden
Surname or Lastname
English
English : nickname for a sociable person, from Middle English fe(a)re ‘comrade’, ‘companion’ (Old English (ge)fēra).English : nickname for a proud or haughty person, from Middle English fere ‘proud’ (Old French fier).
Female
Spanish
Feminine form of Spanish Domingo, DOMINGA means "belongs to the lord."
Boy/Male
Hindu, Indian, Sanskrit
Heavenly; Bright
Biblical
house of fruits, or of food, or of snares
Female
Cornish
, the fair, or, a woman.
Girl/Female
Hebrew
Listen; name of God.
Boy/Male
Indian, Punjabi, Sikh
The First Light at the Horizon
Girl/Female
Australian, Hebrew, Latin
Mother; Form of Madonna; Lady
Girl/Female
Indian
Cheek, Face
CLASS NUMBER
CLASS NUMBER
CLASS NUMBER
CLASS NUMBER
CLASS NUMBER
v. t.
To cover or furnish with glass; to glaze.
a.
Of the best class; of the highest rank; in the first division; of the best quality; first-rate; as, a first-class telescope.
a.
Of the rank or degree below the best highest; inferior; second-rate; as, a second-class house; a second-class passage.
v. t.
To shut or fasten together with, or as with, a clasp; to shut or fasten (a clasp, or that which fastens with a clasp).
a.
Given to viewing one's self in a glass or mirror; finical.
n.
To divide into classes, as students; to form into, or place in, a class or classes.
v. t.
To case in glass.
v. t.
To smooth or polish anything, as leater, by rubbing it with a glass burnisher.
n.
A group of individuals ranked together as possessing common characteristics; as, the different classes of society; the educated class; the lower classes.
v. t.
Variant of Clasp
v. t.
A looking-glass; a mirror.
v. t.
An optical glass; a lens; a spyglass; -- in the plural, spectacles; as, a pair of glasses; he wears glasses.
n.
One of the sections into which a church or congregation is divided, and which is under the supervision of a class leader.
v. t.
A drinking vessel; a tumbler; a goblet; hence, the contents of such a vessel; especially; spirituous liquors; as, he took a glass at dinner.
v. t.
Anything made of glass.
n.
To arrange in classes; to classify or refer to some class; as, to class words or passages.
n.
A number of students in a school or college, of the same standing, or pursuing the same studies.