Structure

category of finite sets and surjections

Notation FS\FS Objects finite sets Morphisms surjective maps Related B\IB, FI\FI, FinSet\FinSet
This category is badly behaved in itself, but it appears in representation theory. It has two connected components, consisting of the empty set and the non-empty finite sets.

Satisfied properties

Assigned properties

Deduced properties

Unsatisfied properties

Assigned properties

Deduced properties*

*This also uses the deduced satisfied properties.

Unknown properties

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Special objects

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Special morphisms