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 May 2 comment Piecewise bijection $f: \Bbb R \to (\Bbb R$ \ $\{1\})$ @user129120 Wow, My bad! For some reason, I thought you were asking for a function $f:\mathbb R \setminus \{1\}\to \mathbb R$. However, Since the function I proposed is a bijection, its inverse is a function from $\mathbb R \to \mathbb R \setminus \{1\}$. Kind of a cheat but still! May 1 comment Piecewise bijection $f: \Bbb R \to (\Bbb R$ \ $\{1\})$ Is there a particular reason why you would need a piece-wise function? Then you could use $\ f:x\to \frac 1{1-x}$. Feb 26 revised Prove that $e ^ π$ > $π ^ e$. Formatting Feb 26 suggested approved edit on Prove that $e ^ π$ > $π ^ e$. Oct 29 revised Epsilon-Delta Continuity proof TeX formatting Oct 29 suggested approved edit on Epsilon-Delta Continuity proof Oct 29 revised Basic Question on Gradients deleted 176 characters in body Sep 16 revised Duality principle in boolean algebra corrected formatting, grammar and spelling Sep 16 awarded Custodian Sep 16 reviewed Reviewed Duality principle in boolean algebra Sep 16 suggested approved edit on Duality principle in boolean algebra Sep 9 asked A Proof relating to the Disjunctive normal form Aug 11 awarded Good Question Jun 15 awarded Informed Jun 9 awarded Popular Question May 28 awarded Yearling May 10 awarded Caucus Apr 8 accepted Proving that these two fields $\mathbb Z_{11}[x]/〈 x^2+1〉$ and $\mathbb Z_{11}[x]/〈 x^2+x+4〉$ are isomorphic with $121$ elements each. Mar 26 awarded Popular Question Feb 19 awarded Popular Question