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0 pointssoVeryTired6y ago0 comments

It shows that subtracting a minus one is equivalent to adding a plus one. The one logical leap that isn't explicitly spelled out is that subtracting X is the same as adding (-1)X. But I'm pretty sure that's the definition of integer multiplication.

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_2d306y ago· 1 in thread

I see how it’s intuition for addition/subtraction but that doesn’t tell us much about multiplication. You’re asserting that negative one times X is itself negative which is in fact what the article is attempting to prove in the first place so by explicitly supposing that, your analogy isn’t useful.

thaumasiotes6y ago

> You’re asserting that negative one times X is itself negative which is in fact what the article is attempting to prove in the first place

Absolutely not. The article explicitly postulates this:

> We also take for granted the fact that the product of a positive real number and a negative real number is a negative real number

You're right that that's the interesting part of the question, but as far as the article is concerned, it's just an uninteresting assumption.

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