# Commit 2021-02-26 07:13 24ed74a2

View on Github →feat(algebra/category/Semigroup/basic): categories of magmas and semigroups (#6387) This PR introduces the category of magmas and the category of semigroups, together with their additive versions.

Mathlib v3 is deprecated. Go to Mathlib v4

feat(algebra/category/Semigroup/basic): categories of magmas and semigroups (#6387) This PR introduces the category of magmas and the category of semigroups, together with their additive versions.