I've read, for instance in, that quantum cohomology is a deformation of singular cohomology, or that quantum de Rham cohomlogy is a deformation of de Rham cohomology. However, I've not found a definition of what this means technically. Is this just a "philosophical" deformation, in the sense that it is a "change", not a deformation of say algebras (as example of a "technical" usage of the term)? I've heard people use the word quantum in relation to $q$-deformation, but I don't know if this is related at all.
2026-03-27 21:03:29.1774645409
In which sense is quantum cohomology a deformation of cohomology?
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