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  2. Symplectic group - Wikipedia

    en.wikipedia.org/wiki/Symplectic_group

    Rather, it is isomorphic to a subgroup of Sp(2n, C), and so does preserve a complex symplectic form in a vector space of twice the dimension. As explained below, the Lie algebra of Sp(n) is the compact real form of the complex symplectic Lie algebra sp(2n, C). Sp(n) is a real Lie group with (real) dimension n(2n + 1). It is compact and simply ...

  3. Schwartz space - Wikipedia

    en.wikipedia.org/wiki/Schwartz_space

    The Fourier transform is a linear isomorphism F:𝒮(R n) → 𝒮(R n). If f ∈ 𝒮(R n) then f is Lipschitz continuous and hence uniformly continuous on R n. 𝒮(R n) is a distinguished locally convex Fréchet Schwartz TVS over the complex numbers. Both 𝒮(R n) and its strong dual space are also: complete Hausdorff locally convex spaces ...

  4. Maximal function - Wikipedia

    en.wikipedia.org/wiki/Maximal_function

    Property (c) says the operator M is bounded on L p (R n); it is clearly true when p = ∞, since we cannot take an average of a bounded function and obtain a value larger than the largest value of the function. Property (c) for all other values of p can then be deduced from these two facts by an interpolation argument.

  5. Cantor's diagonal argument - Wikipedia

    en.wikipedia.org/wiki/Cantor's_diagonal_argument

    To construct a bijection from T to R, start with the tangent function tan(x), which is a bijection from (−π/2, π/2) to R (see the figure shown on the right). Next observe that the linear function h ( x ) = π x – π/2 is a bijection from (0, 1) to (−π/2, π/2) (see the figure shown on the left).

  6. Smoothness - Wikipedia

    en.wikipedia.org/wiki/Smoothness

    Given a smooth manifold, of dimension , and an atlas = {(,)}, then a map : is smooth on if for all there exists a chart (,), such that , and : is a smooth function from a neighborhood of () in to (all partial derivatives up to a given order are continuous).

  7. Friedman's SSCG function - Wikipedia

    en.wikipedia.org/wiki/Friedman's_SSCG_function

    In mathematics, a simple subcubic graph (SSCG) is a finite simple graph in which each vertex has a degree of at most three. Suppose we have a sequence of simple subcubic graphs G 1, G 2, ... such that each graph G i has at most i + k vertices (for some integer k) and for no i < j is G i homeomorphically embeddable into (i.e. is a graph minor of) G j.

  8. List of mathematical functions - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_functions

    Sigma function: Sums of powers of divisors of a given natural number. Euler's totient function: Number of numbers coprime to (and not bigger than) a given one. Prime-counting function: Number of primes less than or equal to a given number. Partition function: Order-independent count of ways to write a given positive integer as a sum of positive ...

  9. Thomae's function - Wikipedia

    en.wikipedia.org/wiki/Thomae's_function

    The function's integral is equal to over any set because the function is equal to zero almost everywhere. If G = { ( x , f ( x ) ) : x ∈ ( 0 , 1 ) } ⊂ R 2 {\displaystyle G=\{\,(x,f(x)):x\in (0,1)\,\}\subset \mathbb {R} ^{2}} is the graph of the restriction of f {\displaystyle f} to ( 0 , 1 ) {\displaystyle (0,1)} , then the box-counting ...