iterated connecting homomorphism

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Bockstein homomorphism — In mathematics, the Bockstein homomorphism in homological algebra is a connecting homomorphism associated with a short exact sequence:0 → P → Q → R → 0of abelian groups, when they are introduced as coefficients into a chain complex C , and which… … Wikipedia
Spectral sequence — In the area of mathematics known as homological algebra, especially in algebraic topology and group cohomology, a spectral sequence is a means of computing homology groups by taking successive approximations. Spectral sequences are a… … Wikipedia
Braid group — In mathematics, the braid group on n strands, denoted by B n , is a certain group which has an intuitive geometrical representation, and in a sense generalizes the symmetric group S n . Here, n is a natural number; if n gt; 1, then B n is an… … Wikipedia

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