On when the union of two algebraic sets is algebraic
Sprache des Titels:
Englisch
Original Kurzfassung:
In universal algebraic geometry, an algebra is called an equational domain if the
union of two algebraic sets is algebraic. We characterize equational domains, with respect
to polynomial equations, inside congruence permutable varieties, and with respect to term
equations, among all algebras of size two and all algebras of size three with a cyclic automor-
phism.
Forschungs-