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posted by  Physstudent on 8/20/2008 11:30:07 PM  |  status: Live  

Reverse Triangle Inequality Proof (just need last step)

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Prove that ||a|-|b||<=|a-b|

i looked online at this website http://math.ucsd.edu/~wgarner/math4c/derivations/other/triangleinequal.htm
and it got me all the way to the end but their final solution is listed as |a|-|b| instead of ||a|-|b|| on the left side of the inequality.  can someone help me with this last step.  Your help is greatly appreciated.

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posted by Galois on 8/20/2008 11:50:16 PM  |  status: Live
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"THANK YOU!!!!"
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