On Commutative Gelfand Rings

A R Aliabad (1) , M Badie (2) , Sajad Nazari (3)

1 SCU - Shahid Chamran University of Ahvaz
2 Jundi-Shapur University of Technology
3 SDS - Sécurité des Données et des Systèmes

By studying and using the quasi-pure part concept, we improve some statements and show that some assumptions in some articles are superfluous. We give some characterizations of Gelfand rings. For example: we prove that R is Gelfand if and only if m (∑ α∈A Iα) =∑α∈A m(Iα), for each family {Iα}α∈A of ideals of R, in addition if R is semiprimitive and Max(R) ⊆ Y ⊆ Spec(R), we show that R is a Gelfand ring if and only if Y is normal. We prove that if R is reduced ring, then R is a von Neumann regular ring if and only if Spec(R) is regular. It has been shown that if R is a Gelfand ring, then Max(R) is a quotient of Spec(R), and sometimes hM(a)’s behave like the zerosets of the space of maximal ideal. Finally, it has been proven that Z(Max(C(X)))= {hM(f) : f ∈ C(X)} if and only if {hM(f) : f ∈ C(X)} is closed under countable intersection if and only if X is pseudocompact.

Mots clés: Gelfand rings; quasi-pure ideal; pure ideal; Zarisky topology; C(X)

Domaines: Informatique [cs]; Mathématiques [math]

A R Aliabad, M Badie, Sajad Nazari. On Commutative Gelfand Rings. Journal of Mathematical Extension, 2021. ⟨hal-03537350⟩