I just want to ask if
n∑i=1i∑j=1|aiˉbj−ajˉbi|2=n∑i=1n∑j=1(aiˉbj−ajˉbi)(ˉaibj+ˉajbi)
is true and possibly an explanation on why the summations change from ∑n to to ∑i
I have injection f:A→B and I want to get bijection. Can I just resting codomain to f(A)? I know that every function i...
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