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arxiv: 1102.0523 · v1 · pith:M7ASUFRCnew · submitted 2011-02-02 · 🧮 math.OA

There are no noncommutative soft maps

classification 🧮 math.OA
keywords coloncategorycompactconstantdendriteeitherhomeomorphismhomomorphism
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It is shown that for a map $f \colon X \to Y$ of compact spaces the unital $\ast$-homomorphism $C(f) \colon C(Y) \to C(X)$ is projective in the category $\operatorname{Mor}({\mathcal C}^{1})$ precisely when $X$ is a dendrite and $f$ is either homeomorphism or a constant.

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