++

M ++ N -- direct sum for modules, matrices, or chain complexes and disjoint union for sets.

The user may install binary methods for this operator with code such as 

              X ++ Y := (x,y) -> ...
where X is the class of x and Y is the class of y.

  • ChainComplex ++ ChainComplex
  • Module ++ Module
  • Set ++ Set

    • See also classes and directSum.

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