sum -- compute the sum

Ways to use sum:

• sum(ChainComplex) -- direct sum of the components of a chain complex
• sum(ChainComplexMap) -- direct sum of the components of a chain map
• sum(List) -- sum the elements of a list
• sum(Set) -- sum of elements
• sum(VirtualTally) -- sum of elements
• sum(VisibleList,Function) -- sum results of applying a function
• sum(VisibleList,VisibleList,Function) -- sum results of applying a function pairwise
• sum(ZZ,Function) -- sum consecutive values of a function

For the programmer

The object sum is a method function.