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# vectors inequality Watch

1. i cant do part b

i cant do part b
Consider .
3. (Original post by Smaug123)
Consider .
i have, it lead to la+bl <= lal + lbl
i have
The theorem is false, now I come to think about it. (Let a={1,0}, b={0,100}.) I suspect there's meant to be a plus sign between |a| and |b|, in which case my hint is correct.
ETA: And in which case, you've proved the triangle inequality as required.
5. (Original post by Smaug123)
The theorem is false, now I come to think about it. (Let a={1,0}, b={0,100}.) I suspect there's meant to be a plus sign between |a| and |b|, in which case my hint is correct.
ETA: And in which case, you've proved the triangle inequality as required.
thanks

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