Let (R, +, ) be a ring. If S, T1 and T2 are subrings of R, and

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Let (R, +, •) be a ring. If S, T1 and T2 are subrings of R, and S ⊂ T1 ∪ T2, prove that S ⊂ T1 or S ⊂ T2.

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Discrete and Combinatorial Mathematics An Applied Introduction

ISBN: 978-0201726343

5th edition

Authors: Ralph P. Grimaldi

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Question Posted: Jun 21, 2016 08:59 AM

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Let (R, +, ) be a ring. If S, T1 and T2 are subrings of R, and

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If not there exist ab S with a T 1 a T 2 and b T 2 b Since S is a subrin...View the full answer

Discrete and Combinatorial Mathematics An Applied Introduction

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