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  2. Dirichlet character - Wikipedia

    en.wikipedia.org/wiki/Dirichlet_character

    The only character mod 2 is the ... The principal character has order 1; other real characters have order 2, ... class number formula. [39] [40] Real characters are ...

  3. Help:Displaying a formula - Wikipedia

    en.wikipedia.org/wiki/Help:Displaying_a_formula

    This screenshot shows the formula E = mc 2 being edited using VisualEditor.The window is opened by typing "<math>" in VisualEditor. The visual editor shows a button that allows to choose one of three offered modes to display a formula.

  4. Rule 90 - Wikipedia

    en.wikipedia.org/wiki/Rule_90

    In Rule 90, each cell's value is computed as the exclusive or of the two neighboring values in the previous time step. Rule 90 is an elementary cellular automaton.That means that it consists of a one-dimensional array of cells, each of which holds a single binary value, either 0 or 1.

  5. Modulo - Wikipedia

    en.wikipedia.org/wiki/Modulo

    If p is a prime number which is not a divisor of b, then ab p−1 mod p = a mod p, due to Fermat's little theorem. Inverse: [(−a mod n) + (a mod n)] mod n = 0. b −1 mod n denotes the modular multiplicative inverse, which is defined if and only if b and n are relatively prime, which is the case when the left hand side is defined: [(b −1 ...

  6. Legendre symbol - Wikipedia

    en.wikipedia.org/wiki/Legendre_symbol

    Quadratic residues are highlighted in yellow, and correspond precisely to the values 0 and 1. In number theory , the Legendre symbol is a multiplicative function with values 1, −1, 0 that is a quadratic character modulo of an odd prime number p : its value at a (nonzero) quadratic residue mod p is 1 and at a non-quadratic residue ( non ...

  7. Modular forms modulo p - Wikipedia

    en.wikipedia.org/wiki/Modular_forms_modulo_p

    Modular forms are analytic functions, so they admit a Fourier series.As modular forms also satisfy a certain kind of functional equation with respect to the group action of the modular group, this Fourier series may be expressed in terms of =.

  8. Cellular automaton - Wikipedia

    en.wikipedia.org/wiki/Cellular_automaton

    The state of each cell in a totalistic cellular automaton is represented by a number (usually an integer value drawn from a finite set), and the value of a cell at time t depends only on the sum of the values of the cells in its neighborhood (possibly including the cell itself) at time t − 1.

  9. Modular arithmetic - Wikipedia

    en.wikipedia.org/wiki/Modular_arithmetic

    A simple consequence of Fermat's little theorem is that if p is prime, then a −1 ≡ a p−2 (mod p) is the multiplicative inverse of 0 < a < p. More generally, from Euler's theorem, if a and m are coprime, then a −1 ≡ a φ(m)−1 (mod m). Hence, if ax ≡ 1 (mod m), then x ≡ a φ(m)−1 (mod m).