Semigroups with apartness
Proving a constructive version of the Spectral Mapping Theorem, Bridges and Havea used a constructive semigroup with inequality in . This motivated us to achieve a little progress in that direction. The starting point is the structure (S,=, =, · ) called a semigroup with apartness. Our primary objective is to prove isomorphism theorems for such constructive semigroups. In doing so our main ideas and notions come from .
Set with apartness, semigroup with apartness, coequivalence, cocongruence