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 Oct 23 revised Prove that the function $\Phi :\mathcal{F}(X,Y)\longrightarrow Y$, is not injective. edited title Oct 22 comment Prove that the function $\Phi :\mathcal{F}(X,Y)\longrightarrow Y$, is not injective. Great, I get it now! Thank you Oct 22 accepted Prove that the function $\Phi :\mathcal{F}(X,Y)\longrightarrow Y$, is not injective. Oct 22 asked Prove that the function $\Phi :\mathcal{F}(X,Y)\longrightarrow Y$, is not injective. Oct 10 revised Proving $\sum_{i=1}^{n}{\frac{i}{2^i}}=2-\frac{n+2}{2^n}$ by induction. added 17 characters in body Oct 10 awarded Editor Oct 10 revised Proving $\sum_{i=1}^{n}{\frac{i}{2^i}}=2-\frac{n+2}{2^n}$ by induction. added 30 characters in body Oct 9 awarded Scholar Oct 9 awarded Supporter Oct 9 accepted Proving $\sum_{i=1}^{n}{\frac{i}{2^i}}=2-\frac{n+2}{2^n}$ by induction. Oct 9 comment Proving $\sum_{i=1}^{n}{\frac{i}{2^i}}=2-\frac{n+2}{2^n}$ by induction. That was quick! Thank you. Oct 9 awarded Student Oct 9 asked Proving $\sum_{i=1}^{n}{\frac{i}{2^i}}=2-\frac{n+2}{2^n}$ by induction.