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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. 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.

  4. Real analysis - Wikipedia

    en.wikipedia.org/wiki/Real_analysis

    A sequence is a function whose domain is a countable, totally ordered set. [2] The domain is usually taken to be the natural numbers , [ 3 ] although it is occasionally convenient to also consider bidirectional sequences indexed by the set of all integers, including negative indices.

  5. 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).

  6. Secondary School Mathematics Curriculum Improvement Study

    en.wikipedia.org/wiki/Secondary_School...

    Work on the SSMCIS program began in 1965 [3] and took place mainly at Teachers College. [9] Fehr was the director of the project from 1965 to 1973. [1] The principal consultants in the initial stages and subsequent yearly planning sessions were Marshall H. Stone of the University of Chicago, Albert W. Tucker of Princeton University, Edgar Lorch of Columbia University, and Meyer Jordan of ...

  7. Subadditivity - Wikipedia

    en.wikipedia.org/wiki/Subadditivity

    An example is the square root function, having the non-negative real numbers as domain and codomain: since , we have: + +. A sequence { a n } n ≥ 1 {\displaystyle \left\{a_{n}\right\}_{n\geq 1}} is called subadditive if it satisfies the inequality a n + m ≤ a n + a m {\displaystyle a_{n+m}\leq a_{n}+a_{m}} for all m and n .

  8. Generalized arithmetic progression - Wikipedia

    en.wikipedia.org/wiki/Generalized_arithmetic...

    For example, the sequence,,,,, … is not an arithmetic progression, but is instead generated by starting with 17 and adding either 3 or 5, thus allowing multiple common differences to generate it. A semilinear set generalizes this idea to multiple dimensions – it is a set of vectors of integers, rather than a set of integers.

  9. Splitting lemma - Wikipedia

    en.wikipedia.org/wiki/Splitting_lemma

    For a direct sum this is clear, as one can inject from or project to the summands. For a left split sequence, the map t × r: B → A × C gives an isomorphism, so B is a direct sum (3.), and thus inverting the isomorphism and composing with the natural injection C → A × C gives an injection C → B splitting r (2.).

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