Suppose that R₁ is a ring with addition +1 and multiplication 1, and that R2 is a ring with addition +2 and multiplication 2. Prove that the set R₁ x R2, with addition given by (11, 12) + (81, 82) := (1 +1 81, 12 +2 82) and multiplication given by (11, 12). (81, 82) := (r1·181, 12 2 82) is a ring. This ring is called the product of rings R₁ and R2.

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