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Spring cleaning day #12

Name: Anonymous 2007-01-08 7:21

Spring cleaning day #12

Name: Anonymous 2013-08-31 22:41



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Name: Anonymous 2013-08-31 23:09


Another equivalent axiom only considers collections X that are essentially powersets of other sets:

Name: Anonymous 2013-08-31 23:54


The axiom of constructibility and the generalized continuum hypothesis both imply the axiom of choice, but are strictly stronger than it.

Name: Anonymous 2013-09-01 0:06



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Name: Anonymous 2013-09-01 0:39




    Gödel's completeness theorem for first-order logic: every consistent set of first-order sentences has a completion. That is, every consistent set of first-order sentences can be extended to a maximal consistent set.

Name: Anonymous 2013-09-01 1:24


Associativity: If f : a → b, g : b → c and h : c → d then h ∘ (g ∘ f) = (h ∘ g) ∘ f, and

Name: Anonymous 2013-09-01 1:31



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Name: Anonymous 2013-09-01 2:09




There are two operations which are defined on every morphism, the domain (or source) and the codomain (or target).

Name: Anonymous 2013-09-01 2:55


Endofunctor: A functor that maps a category to itself.

Name: Anonymous 2013-09-01 2:56




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Name: Anonymous 2013-09-01 9:56


Set theory is commonly employed as a foundational system for mathematics, particularly in the form of Zermelo–Fraenkel set theory with the axiom of choice. Beyond its foundational role, set theory is a branch of mathematics in its own right, with an active research community. Contemporary research into set theory includes a diverse collection of topics, ranging from the structure of the real number line to the study of the consistency of large cardinals.

Name: Anonymous 2013-09-01 10:42


κ·μ = 0 → (κ = 0 or μ = 0).

Name: Anonymous 2013-09-01 11:27


As in real analysis, in complex analysis the symbol \infty, called "infinity", denotes an unsigned infinite limit. x ightarrow \infty means that the magnitude |x| of x grows beyond any assigned value. A point labeled \infty can be added to the complex plane as a topological space giving the one-point compactification of the complex plane. When this is done, the resulting space is a one-dimensional complex manifold, or Riemann surface, called the extended complex plane or the Riemann sphere.

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