14.2.8 Corepresentably Conservative Morphisms

Let $\mathcal{C}$ be a bicategory.

A $1$-morphism $f\colon A\to B$ of $\mathcal{C}$ is corepresentably conservative if, for each $X\in \operatorname {\mathrm{Obj}}(\mathcal{C})$, the functor

\[ f^{*}\colon \mathsf{Hom}_{\mathcal{C}}(B,X)\to \mathsf{Hom}_{\mathcal{C}}(A,X) \]

given by precomposition by $f$ is conservative.

In detail, $f$ is corepresentably conservative if, for each pair of morphisms $\phi ,\psi \colon B\rightrightarrows X$ and each $2$-morphism

of $\mathcal{C}$, if the $2$-morphism
is a $2$-isomorphism, then so is $\alpha $.


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