Does every arrow in a thin category neccessarily have to be monic and epic by default?

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In other words, will there ever be an arrow in a thin category that is not either monic or epic?

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Yes, arrows in a thin category are all monic and epic. The definition of monic or epic is an implication, which ends "... then $f,g: X \to Y$ are equal". Since any two arrows with the same domain and codomain are equal in a thin category, this holds, and thus the implication holds vacuously.