Prove: If the pullback of two morphisms $p : E \rightarrow E$ and $q : D \rightarrow D$ exists, then it is unique to equivalence.
What does it mean to show that the pullback $(Z, r, s)$ is unique to equivalence?
2026-05-16 04:20:59.1778905259
What does it mean to show that the pullback of two morphisms is "unique to equivalence"?
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It means that if $(\mathbb Z',r',s')$ also is a pullback, then there is a unique isomorphism $\phi:\mathbb Z\to\mathbb Z'$ such that the completed diagram is commutative.