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  2. Open book decomposition - Wikipedia

    en.wikipedia.org/wiki/Open_book_decomposition

    In mathematics, an open book decomposition (or simply an open book) is a decomposition of a closed oriented 3-manifold M into a union of surfaces (necessarily with boundary) and solid tori. Open books have relevance to contact geometry , with a famous theorem of Emmanuel Giroux (given below) that shows that contact geometry can be studied from ...

  3. Calderón–Zygmund lemma - Wikipedia

    en.wikipedia.org/wiki/Calderón–Zygmund_lemma

    This leads to the associated Calderón–Zygmund decomposition of f , wherein f is written as the sum of "good" and "bad" functions, using the above sets. Covering lemma [ edit ]

  4. Krohn–Rhodes theory - Wikipedia

    en.wikipedia.org/wiki/Krohn–Rhodes_theory

    Let T be a semigroup. A semigroup S that is a homomorphic image of a subsemigroup of T is said to be a divisor of T.. The Krohn–Rhodes theorem for finite semigroups states that every finite semigroup S is a divisor of a finite alternating wreath product of finite simple groups, each a divisor of S, and finite aperiodic semigroups (which contain no nontrivial subgroups).

  5. Whitney covering lemma - Wikipedia

    en.wikipedia.org/wiki/Whitney_covering_lemma

    In mathematical analysis, the Whitney covering lemma, or Whitney decomposition, asserts the existence of a certain type of partition of an open set in a Euclidean space. Originally it was employed in the proof of Hassler Whitney's extension theorem. The lemma was subsequently applied to prove generalizations of the Calderón–Zygmund ...

  6. Lebesgue's decomposition theorem - Wikipedia

    en.wikipedia.org/wiki/Lebesgue's_decomposition...

    In mathematics, more precisely in measure theory, the Lebesgue decomposition theorem [1] provides a way to decompose a measure into two distinct parts based on their relationship with another measure.

  7. Decomposition of a module - Wikipedia

    en.wikipedia.org/wiki/Decomposition_of_a_module

    A decomposition with local endomorphism rings [5] (cf. #Azumaya's theorem): a direct sum of modules whose endomorphism rings are local rings (a ring is local if for each element x, either x or 1 − x is a unit). Serial decomposition: a direct sum of uniserial modules (a module is uniserial if the lattice of submodules is a finite chain [6]).

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