Homotopy Type Theory image > history (Rev #1)

Definition

Given a function f:ABf:A \to B, we define the propositional image of ff as

im(f) y:B[fiber(f,y)]\mathrm{im}(f) \coloneqq \sum_{y:B} \left[\mathrm{fiber}(f, y)\right]

See also

References

  • Marc Bezem, Ulrik Buchholtz, Pierre Cagne, Bjørn Ian Dundas, and Daniel R. Grayson, Symmetry book (2021)

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