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minimal ultrafilter

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  • Ultrafiltre — En mathématiques, et plus précisément en théorie des ensembles, un ultrafiltre sur un ensemble X est une collection de sous ensembles de X qui est un filtre, et qui n est pas contenue dans un filtre plus grand. On peut considérer un ultrafiltre… …   Wikipédia en Français

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  • Basis (linear algebra) — Basis vector redirects here. For basis vector in the context of crystals, see crystal structure. For a more general concept in physics, see frame of reference. In linear algebra, a basis is a set of linearly independent vectors that, in a linear… …   Wikipedia

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