|x - y|<=|x|+|y| Does anyone know if the above is a true statment? Or is it just a lecture typo intending to be either: |x + y|<=|x|+|y| |x - y|<=|x|-|y|
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Is this true $\displaystyle |-y|=|y|~?$ Is this true $\displaystyle \left| {x - y} \right| = \left| {x + \left( { - y} \right)} \right| \leqslant \left| x \right| + \left| { - y} \right|~?$
Thanks
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