Relative Homology
For a subspace, the relative homology Hn(X, A) is understood to be the homology of the quotient of the chain complexes, that is,
where the quotient of chain complexes is given by the short exact sequence
Read more about this topic: Singular Homology
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“Three elements go to make up an idea. The first is its intrinsic quality as a feeling. The second is the energy with which it affects other ideas, an energy which is infinite in the here-and-nowness of immediate sensation, finite and relative in the recency of the past. The third element is the tendency of an idea to bring along other ideas with it.”
—Charles Sanders Peirce (1839–1914)
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