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  2. Limit of a function - Wikipedia

    en.wikipedia.org/wiki/Limit_of_a_function

    The definition of limit given here does not depend on how (or whether) f is defined at p. Bartle [9] refers to this as a deleted limit, because it excludes the value of f at p. The corresponding non-deleted limit does depend on the value of f at p, if p is in the domain of f. Let : be a real-valued function.

  3. Limit (category theory) - Wikipedia

    en.wikipedia.org/wiki/Limit_(category_theory)

    create limits for F if whenever (L, φ) is a limit of GF there exists a unique cone (L′, φ′) to F such that G(L′, φ′) = (L, φ), and furthermore, this cone is a limit of F. reflect limits for F if each cone to F whose image under G is a limit of GF is already a limit of F. Dually, one can define creation and reflection of colimits.

  4. Euclid's lemma - Wikipedia

    en.wikipedia.org/wiki/Euclid's_lemma

    This property is the key in the proof of the fundamental theorem of arithmetic. [note 2] It is used to define prime elements, a generalization of prime numbers to arbitrary commutative rings. Euclid's lemma shows that in the integers irreducible elements are also prime elements. The proof uses induction so it does not apply to all integral domains.

  5. List of limits - Wikipedia

    en.wikipedia.org/wiki/List_of_limits

    This is a list of limits for common functions such as elementary functions. In this article, the terms a, b and c are constants with respect to x.

  6. Squeeze theorem - Wikipedia

    en.wikipedia.org/wiki/Squeeze_theorem

    Indeed, if a is an endpoint of I, then the above limits are left- or right-hand limits. A similar statement holds for infinite intervals: for example, if I = (0, ∞), then the conclusion holds, taking the limits as x → ∞. This theorem is also valid for sequences. Let (a n), (c n) be two sequences converging to ℓ, and (b n) a sequence.

  7. Science Buddies - Wikipedia

    en.wikipedia.org/wiki/Science_Buddies

    Science Buddies mission is to help students to build their literacy in science and technology so they can become productive and engaged citizens in the 21st century. The site has personalized learning tools, over 15,000 pages of scientist-developed subject matter (including experiments based on the latest academic research), and an online ...

  8. Proofs and Refutations - Wikipedia

    en.wikipedia.org/wiki/Proofs_and_Refutations

    The 1976 book Proofs and Refutations is based on the first three chapters of his 1961 four-chapter doctoral thesis Essays in the Logic of Mathematical Discovery.But its first chapter is Lakatos's own revision of its chapter 1 that was first published as Proofs and Refutations in four parts in 1963–4 in the British Journal for the Philosophy of Science.

  9. Realizability - Wikipedia

    en.wikipedia.org/wiki/Realizability

    In mathematical logic, realizability is a collection of methods in proof theory used to study constructive proofs and extract additional information from them. [1] Formulas from a formal theory are "realized" by objects, known as "realizers", in a way that knowledge of the realizer gives knowledge about the truth of the formula.

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