The question is: are the following two functions equivalent? And if yes, what properties of the absolute value should I use to prove it?
$f_1(x,y,z)$ = $|\, x + |y+z| \,|$
$f_2(x,y,z)$ = $| \,|x+y| + z \,|$
2026-03-28 08:47:56.1774687676
Nested absolute operations
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