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  2. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  3. Greek letters used in mathematics, science, and engineering

    en.wikipedia.org/wiki/Greek_letters_used_in...

    the differentiability class (i.e.) for functions that are infinitely differentiable because they are complex analytic; the first infinite ordinal; the omega meson; the set of natural numbers in set theory (although or N is more common in other areas of mathematics)

  4. Principia Mathematica - Wikipedia

    en.wikipedia.org/wiki/Principia_Mathematica

    Sections 10, 11, 12: Properties of a variable extended to all individuals: section 10 introduces the notion of "a property" of a "variable". PM gives the example: φ is a function that indicates "is a Greek", and ψ indicates "is a man", and χ indicates "is a mortal" these functions then apply to a variable x .

  5. Mathematical constant - Wikipedia

    en.wikipedia.org/wiki/Mathematical_constant

    The circumference of a circle with diameter 1 is π.. A mathematical constant is a number whose value is fixed by an unambiguous definition, often referred to by a special symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  6. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    Because ⁠ ⁠ is a ratio between positive quantities, ⁠ ⁠ is necessarily the positive root. [10] The negative root is in fact the negative inverse ⁠ − 1 / φ {\displaystyle -1/\varphi } ⁠ , which shares many properties with the golden ratio.

  7. List of mathematical functions - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_functions

    Algebraic functions are functions that can be expressed as the solution of a polynomial equation with integer coefficients.. Polynomials: Can be generated solely by addition, multiplication, and raising to the power of a positive integer.

  8. Representation theory of SU(2) - Wikipedia

    en.wikipedia.org/wiki/Representation_theory_of_SU(2)

    The character is easily seen to be a class function, that is, invariant under conjugation. In the SU(2) case, the fact that the character is a class function means it is determined by its value on the maximal torus T {\displaystyle T} consisting of the diagonal matrices in SU(2), since the elements are orthogonally diagonalizable with the ...

  9. e (mathematical constant) - Wikipedia

    en.wikipedia.org/wiki/E_(mathematical_constant)

    The number e is a mathematical constant approximately equal to 2.71828 that is the base of the natural logarithm and exponential function.It is sometimes called Euler's number, after the Swiss mathematician Leonhard Euler, though this can invite confusion with Euler numbers, or with Euler's constant, a different constant typically denoted .