Can someone solve this problem? PROVE: For any real numbers a and b ||a|-|b||≤ |a-b|
Last edited by mr fantastic; September 21st 2010 at 01:43 AM. Reason: Deletd duplicate question, re-titled.
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You need to know the triangular inequality. . Since . If we take the modulus of both sides, we have .
Last edited by mr fantastic; September 21st 2010 at 01:44 AM.
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