R Kumar, A Gaur - Journal of Algebra & Its Applications, 2018 - search.ebscohost.com
Let R, T be commutative rings with identity such that R⊆ T. A ring extension R⊆ T is called a
Δ-extension of rings if R 1+ R 2 is a subring of T for each pair of subrings R 1, R 2 of T …