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  2. Bijection - Wikipedia

    en.wikipedia.org/wiki/Bijection

    A bijection, bijective function, or one-to-one correspondence between two mathematical sets is a function such that each element of the second set (the codomain) ...

  3. Bijection, injection and surjection - Wikipedia

    en.wikipedia.org/wiki/Bijection,_injection_and...

    The formal definition is the following. The function : ... A bijective function is also called a bijection or a one-to-one correspondence ...

  4. Surjective function - Wikipedia

    en.wikipedia.org/wiki/Surjective_function

    In mathematics, a surjective function (also known as surjection, or onto function / ˈ ɒ n. t uː /) is a function f such that, for every element y of the function's codomain, there exists at least one element x in the function's domain such that f(x) = y.

  5. Equinumerosity - Wikipedia

    en.wikipedia.org/wiki/Equinumerosity

    The definition of equinumerosity using bijections can be applied to both ... For every bijection between two sets A and B there exists an inverse function which is a ...

  6. Equivalence relation - Wikipedia

    en.wikipedia.org/wiki/Equivalence_relation

    A term's definition may require additional properties that are not listed in this table. ... then is a bijection. Equivalence kernel . The ...

  7. Cantor's diagonal argument - Wikipedia

    en.wikipedia.org/wiki/Cantor's_diagonal_argument

    Define the bijection g(t) from T to (0, 1): If t is the n th string in sequence s, let g(t) be the n th number in sequence r ; otherwise, g(t) = 0.t 2. 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).

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  9. Schröder–Bernstein theorem - Wikipedia

    en.wikipedia.org/wiki/Schröder–Bernstein_theorem

    Hence it suffices to produce a bijection between the elements of A and B in each of the sequences separately, as follows: Call a sequence an A-stopper if it stops at an element of A, or a B-stopper if it stops at an element of B. Otherwise, call it doubly infinite if all the elements are distinct or cyclic if it repeats. See the picture for ...