Asked by ALBERT
Need help with three proofs.
Proof#1:
Prove that |x+y| is less than or equal to |x|+|y|
Proof#2:
Prove that |x|-|y| is less than or equal to |x-y|
Proof#3:
Prove that |x+y+z| is less than or equal to |x|+|y|+|z|.
Proof#1:
Prove that |x+y| is less than or equal to |x|+|y|
Proof#2:
Prove that |x|-|y| is less than or equal to |x-y|
Proof#3:
Prove that |x+y+z| is less than or equal to |x|+|y|+|z|.
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