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extendFromMiddle -- extends a map between ChainComplexes



If f is a map to F1_i from F2_0, the script computes a ChainComplexMap to F1 from F2e, where F2e is a chain complex obtained from F2 by prepending zeros.


the process of making a new ChainComplex seems to destroy the direct sum information in the source and target modules.

Ways to use extendFromMiddle :

For the programmer

The object extendFromMiddle is a method function.