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Acyclic Chain Complex

An acyclic chain complex C__ over a commutative ring A, with C_r an A-module for r=0,1,2,..., is a chain complex of the form

C__:...->C_n->C_(n-1)->C_(n-2)->...->C_2->C_1->C_0

whose rth homology group H_r(C__) is trivial for all values r>=0.

A straightforward result in homological algebra states that a chain complex C__ with each C_r free is acyclic iff there exists a chain contraction Gamma:0=1:C->C.

See also

Chain Complex, Chain Contraction, Commutative Ring, Free Module, Homological Algebra, Homology, Homology Group, Module

Portions of this entry contributed by Christopher Stover

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References

Ranicki, A. "Notes on Reidemeister Torsion." 2001. https://webhomes.maths.ed.ac.uk/~v1ranick/papers/torsion.pdf.

Referenced on Wolfram|Alpha

Acyclic Chain Complex

Cite this as:

Weisstein, Eric W., with contributions by Christopher Stover. "Acyclic Chain Complex." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/AcyclicChainComplex.html

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