Module [...] -- make a chain complex from a module

Module [...] -- make a chain complex from a module

Synopsis:

Operator: symbol " " -- blank operator for adjacent expressions

Input:

an instance of class Module.

an instance of class Array.

Output:

an instance of class ChainComplex.

M[n] -- create a chain complex with the module M concentrated in degree -n.

See also:

ChainComplex -- the class of all chain complexes

Code:

     -- ../../../Macaulay2/m2/chaincomplexes.m2:816-823
     Module Array := ChainComplex => (M,v) -> (
          if #v =!= 1 then error "expected array of length 1";
          n := v#0;
          if class n =!= ZZ then error "expected [n] with n an integer";
          C := new ChainComplex;
          C.ring = ring M;
          C#-n = M;
          C)