Hi guys, I'm doing a case by case proof of

from Spivak, and he says:

When and , we must prove that:

I'm a bit stuck on his line of reasoning, could someone explain why we have to prove the above?

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- Jun 5th 2010, 05:38 AMroweProving |a+b| = |a|+|b|
Hi guys, I'm doing a case by case proof of

from Spivak, and he says:

When and , we must prove that:

I'm a bit stuck on his line of reasoning, could someone explain why we have to prove the above? - Jun 5th 2010, 06:05 AMPlato
- Jun 5th 2010, 06:28 AMrowe
Typo, sorry. Fixed original post

- Jun 5th 2010, 09:53 AMrunning-gag