Can I say something like, ∀ x,y ∈ B, x + (-y) ∈ B ⇒ x - y ∈ B by definition of subtraction?? I'm lost
2026-04-07 07:58:58.1775548738
Prove: A nonempty subset B of a ring A is closed with respect to addition and negatives iff B is closed with respect to subtraction
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