https://unimath.github.io/agda-unimath/foundation.action-on-equivalences-functions-out-of-subuniverses.html
The action on equivalences of functions out of subuniverses - agda-unimath
A community-driven library of formalized mathematics from a univalent point of view using the dependently typed programming language Agda.
the actionequivalencesfunctionssubuniversesagda
https://agda-algebras.universalalgebra.org/Setoid/Subalgebras/Subuniverses/
Subuniverses - The Agda Universal Algebra Library
A formalization of universal algebra in dependent type theory — signatures, algebras, homomorphisms, terms, subalgebras, varieties, and a machine-checked proof...
universal algebrasubuniversesagdalibrary