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K-Theory edit
Something about the mapping cone of a map of c*-algebras is missing. cf. N.E. Wegge-Olsen: K-Theory and C*-Algebras.
Beyond ridiculous edit
This is the first sentence of the article:
""In mathematics, especially homotopy theory, the mapping cone is a construction of topology, analogous to a quotient space."
It is beyond ridiculous to call the mapping cone "analogous to" a quotient space, because a mapping cone is a quotient space.