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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

  • 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

  • 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

  • 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

  • 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)

  • 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

  • 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)

  • 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

  • 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

  • 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

  • 2002
  • Calendar year

    Retrieved October 7, 2024. Weisstein, Eric W. "MathWorld News: Primality Testing Is Easy". MathWorld. Retrieved October 13, 2024. "Chechen gets life

    2002

    2002

    2002

  • 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

  • Logical conjunction
  • Logical connective AND

    South Holland: D. Reidel, passim. Weisstein, Eric W. "Conjunction". MathWorld--A Wolfram Web Resource. Retrieved 24 September 2024. Smith, Peter. "Types

    Logical conjunction

    Logical conjunction

    Logical_conjunction

  • 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)

  • 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

  • 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

  • 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)

  • 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

  • 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)

  • 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

  • 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

  • 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

  • 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)

  • 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

  • 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

  • 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

  • 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)

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • Football
  • Group of related team sports

    "Official Guide – Part 2" (PDF). Weisstein, Eric W. "Lemon Surface". mathworld.wolfram.com. Retrieved 31 October 2024. The minimum (or typical, if there

    Football

    Football

    Football

  • 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)

  • 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

  • 200 (number)
  • Natural number

    oeis.org. Retrieved 2026-06-17. Weisstein, Eric W. "Abundant Number". mathworld.wolfram.com. Retrieved 2026-06-17. "Sloane's A000931 : Padovan sequence"

    200 (number)

    200_(number)

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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)

  • 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

  • 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

  • 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)

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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)

  • 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

  • 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)

  • 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)

  • 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

  • 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

  • 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

  • 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)

  • 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

  • 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

  • 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

  • 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)

  • 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)

  • Minute
  • Unit of time equal to 60 seconds

    Edition, entry on Minute. West Publishing Company, St. Paul, Minnesota, 1991.[ISBN missing] Eric W. Weisstein. "Arc Minute." From MathWorld – A Wolfram

    Minute

    Minute

    Minute

  • 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

  • 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)

  • 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)

  • 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

  • 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

  • Octagon
  • Polygon shape with eight sides

    Wayback Machine Weisstein, Eric. "Octagon." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/Octagon.html Alsina, Claudi; Nelsen,

    Octagon

    Octagon

    Octagon

  • 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)

  • Prime (symbol)
  • Typographical symbol

    Usage Stack Exchange. Retrieved 6 June 2020. Weisstein, Eric W. "Prime". mathworld.wolfram.com. Retrieved 31 August 2020. "Triatomic Spectral Database -

    Prime (symbol)

    Prime_(symbol)

  • Standard deviation
  • Measure of variation in statistics

    January 2021, p. 16, Table 12 Weisstein, Eric W. "Standard Deviation". mathworld.wolfram.com. Retrieved 21 August 2020. "Consistent estimator". www.statlect

    Standard deviation

    Standard deviation

    Standard_deviation

  • Abscissa and ordinate
  • Horizontal and vertical axes/coordinate numbers of a 2D coordinate system or graph

    Weisstein, Eric W. "Abscissa". MathWorld. Retrieved 14 July 2013. Hedegaard, Rasmus; Weisstein, Eric W. "Ordinate". MathWorld. Retrieved 14 July 2013. "Cartesian

    Abscissa and ordinate

    Abscissa and ordinate

    Abscissa_and_ordinate

  • Euler's constant
  • Difference between logarithm and harmonic series

    Eric W. "Digamma Function". mathworld.wolfram.com. Retrieved 2024-10-30. Weisstein, Eric W. "Stieltjes Constants". mathworld.wolfram.com. Retrieved 2024-11-01

    Euler's constant

    Euler's constant

    Euler's_constant

  • 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

  • Möbius function
  • Multiplicative function in number theory

    Abramowitz & Stegun 1972, p. 826. Weisstein, Eric W. "Möbius Function". mathworld.wolfram.com. Retrieved 1 October 2024. Jacobson 2009, §4.13. Bost & Connes

    Möbius function

    Möbius_function

  • 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

  • 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)

  • 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

  • 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)

  • 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)

  • 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)

  • Mnemonics in trigonometry
  • Mathematical memory aids

     51. ISBN 0-7487-3396-5. OCLC 47985033. Weisstein, Eric W. "SOHCAHTOA". MathWorld. Foster, Jonathan K. (2008). Memory: A Very Short Introduction. Oxford

    Mnemonics in trigonometry

    Mnemonics in trigonometry

    Mnemonics_in_trigonometry

  • Great stellated dodecahedron
  • Kepler–Poinsot polyhedron

    dodecahedron" ("Uniform polyhedron") at MathWorld. Weisstein, Eric W. "Three stellations of the dodecahedron". MathWorld. Uniform polyhedra and duals

    Great stellated dodecahedron

    Great stellated dodecahedron

    Great_stellated_dodecahedron

  • Beta
  • Second letter of the Greek alphabet

    de conjunto" (PDF). Panace@. 14 (37): 104. Weisstein, Eric W. "Beta". mathworld.wolfram.com. Retrieved January 22, 2025. A financial measure of a fund's

    Beta

    Beta

  • Conway polyhedron notation
  • Method of describing higher-order polyhedra

    Eric W. "Rectification". MathWorld. Weisstein, Eric W. "Cumulation". MathWorld. Weisstein, Eric W. "Truncation". MathWorld. "Antiprism - Chirality issue

    Conway polyhedron notation

    Conway polyhedron notation

    Conway_polyhedron_notation

  • E (mathematical constant)
  • 2.71828...; base of natural logarithms

    Andrews, Scotland. Retrieved 31 October 2023. Weisstein, Eric W. "e". mathworld.wolfram.com. Retrieved 2020-08-10. Pickover, Clifford A. (2009). The Math

    E (mathematical constant)

    E (mathematical constant)

    E_(mathematical_constant)

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

    (sequence A133613 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

  • Square root
  • Number whose square is a given number

    p. 208[which?]. ISBN 978-0-486-67766-8. Weisstein, Eric W. "Radical". mathworld.wolfram.com. Retrieved 2026-05-19. Zill, Dennis G.; Shanahan, Patrick

    Square root

    Square root

    Square_root

  • 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

  • Sexy primes
  • Prime numbers which differ by 6

    1186/s40687-014-0012-7. MR 3373710. S2CID 119699189. Weisstein, Eric W. "Sexy Primes". MathWorld. Grime, James. Brady Haran (ed.). "Sexy Primes (and the only sexy prime

    Sexy primes

    Sexy_primes

  • 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)

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