- #1
boy_travels
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Let x and y be n-tuples of non-negative integers.
Furthermore,
sum x_i = sum y_i
and,
sum x_i^2 = sum y_i^2
Is it true that x must be a permutation of y?
Cheers!
Furthermore,
sum x_i = sum y_i
and,
sum x_i^2 = sum y_i^2
Is it true that x must be a permutation of y?
Cheers!