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A comment on A visual proof that a^2 – b^2 = (a + b)(a – b). Parent comment
1 x 1
1 x -1
-1 x -1
Is just the middle one a cut out?
I reckon you need the axiom from the field to do generalize this to negative numbers.
https://en.m.wikipedia.org/wiki/Field_(mathematics)
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1 x 1
1 x -1
-1 x -1
Is just the middle one a cut out?
I reckon you need the axiom from the field to do generalize this to negative numbers.
https://en.m.wikipedia.org/wiki/Field_(mathematics)