Inequality proof problem

  • Thread starter annoymage
  • Start date
  • #1
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Homework Statement



l lxl - lyl l =< lx-yl

Homework Equations



n/a

The Attempt at a Solution



how do i proof this? give me a start please, should i use definition absolute values and consider all of the cases? or use triangle inequality(but i can't figure out how)
 

Answers and Replies

  • #2
362
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hey i get it, use x=(x-y)+y
 

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