ChainComplex _ ZZ -- get component

ChainComplex _ ZZ -- get component

Synopsis:

Operator: _

Input:

an instance of class ChainComplex.

an instance of class ZZ.

Output:

an instance of class Module.

Next more general method: GradedModule _ ZZ

C_i -- yields the i-th module in a chain complex C.

Returns the zero module if no module has been stored in the i-th spot. You can use code like C#?i to determine if there is a module in the i-th spot, but if the chain complex arose as a resolution, first use complete ChainComplex to fill all the spots with their modules.