Title. I know it goes like that, but as an non mathematician can’t explain it to him.
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The title is more of an example. Good answers, but I should’ve elaborated my problem.
I’m a teacher and me and my student know that -(-) is a +. But he stubbornly wants to know why that is so. I can give him the examples and he somewhat buys them, but is there some (eli5) mathematical reasoning that I can give him?
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