A decomposition of a module into a direct sum of submodules. The index set for the collection of submodules is then called the grading set.
Graded modules arise naturally in homology. In particular, for every integer
, there exists an
th homology group of a space
, and usually the "total homology" of the space is considered to be the direct sum of all the
s. This makes the "total" homology of
a module graded over the integers.
Graded modules arise naturally in homology. In particular, for every integer





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