Cohomology and Differential Forms - Izy Vaisman
The objects with which we usually operate in mathematics are called classes; they arise by abstraction from the intuitive notion of a collection of things. This intuitive image is unsatisfactory for mathematical operations because it gives rise to contradictions, so we must consider classes as defined by a determined system of axioms. We consider here the same system of axioms as in the book Universal Algebra, by P. M. Cohn.
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