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  2. Arithmetic combinatorics - Wikipedia

    en.wikipedia.org/wiki/Arithmetic_combinatorics

    The Green–Tao theorem, proved by Ben Green and Terence Tao in 2004, [3] states that the sequence of prime numbers contains arbitrarily long arithmetic progressions. In other words, there exist arithmetic progressions of primes, with k terms, where k can be any natural number. The proof is an extension of Szemerédi's theorem.

  3. Nested intervals - Wikipedia

    en.wikipedia.org/wiki/Nested_intervals

    For example, the ancient Babylonians discovered a method for computing square roots of numbers. In contrast, the famed Archimedes constructed sequences of polygons, that inscribed and circumscribed a unit circle , in order to get a lower and upper bound for the circles circumference - which is the circle number Pi ( π {\displaystyle \pi } ).

  4. Net (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Net_(mathematics)

    In mathematics, more specifically in general topology and related branches, a net or Moore–Smith sequence is a function whose domain is a directed set. The codomain of this function is usually some topological space. Nets directly generalize the concept of a sequence in a metric space.

  5. Harmonic progression (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Harmonic_progression...

    In mathematics, a harmonic progression (or harmonic sequence) is a progression formed by taking the reciprocals of an arithmetic progression, which is also known as an arithmetic sequence. Equivalently, a sequence is a harmonic progression when each term is the harmonic mean of the neighboring terms.

  6. Mathematical object - Wikipedia

    en.wikipedia.org/wiki/Mathematical_object

    Mathematical constructivism asserts that it is necessary to find (or "construct") a specific example of a mathematical object in order to prove that an example exists. Contrastingly, in classical mathematics, one can prove the existence of a mathematical object without "finding" that object explicitly, by assuming its non-existence and then ...

  7. de Bruijn index - Wikipedia

    en.wikipedia.org/wiki/De_Bruijn_index

    A variable n is bound if it is in the scope of at least n binders (λ); otherwise it is free. The binding site for a variable n is the nth binder it is in the scope of, starting from the innermost binder. The most primitive operation on λ-terms is substitution: replacing free variables in a term with

  8. Modes of convergence - Wikipedia

    en.wikipedia.org/wiki/Modes_of_convergence

    The sequence of partial sums obtained by grouping is a subsequence of the partial sums of the original series. The convergence of each absolutely convergent series is an equivalent condition for a normed vector space to be Banach (i.e.: complete).

  9. Contiguity (probability theory) - Wikipedia

    en.wikipedia.org/wiki/Contiguity_(probability...

    We say that Q n is contiguous with respect to P n (denoted Q n P n) if for every sequence A n of measurable sets, P n (A n) → 0 implies Q n (A n) → 0. The sequences P n and Q n are said to be mutually contiguous or bi-contiguous (denoted Q n P n ) if both Q n is contiguous with respect to P n and P n is contiguous with respect to Q n .

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