Identities of a five-element 0-simple semigroup.
Identities over the two-element alphabet.
Identities valid globally in semigroups.
Infinite words and permutation properties.
Inflation of a union of groups
Inverse monoids and rational Schreier subsets of the free group.
Inverse monoids and rational subsets of related groups.
Isotopy invariant quasigroup identities
According to S. Krstić, there are only four quadratic varieties which are closed under isotopy. We give a simple procedure generating quadratic identities and deciding which of the four varieties they define. There are about 37000 such identities with up to five variables.