Use induction to prove $\displaystyle\sum_{i=0}^n i^3 = \Bigl(\sum_{i=0}^n i\Bigr)^2$
How do I prove this using Induction?
I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...
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