When I first saw topogenous relations at first I thought that my definition of funcoids was plagiarized (for some special case).

But then I looked the year of publication. It was 1963, long before discovery of funcoids.

Topogenous relations are a trivial generalization of funcoids. However, I doubt whether anyone (except of myself) has defined $latex \langle f\rangle$ and $latex \langle f^{-1}\rangle$ for a funcoid, what allows to construct all beautiful theory of funcoids.

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