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 Jan28 awarded Popular Question Jan2 awarded Yearling Dec9 awarded Caucus Oct26 accepted Is it a wrong exercise in Pinter's Algebra? Oct26 comment Is it a wrong exercise in Pinter's Algebra? No, this question is supposed to be proved. Oct26 revised Is it a wrong exercise in Pinter's Algebra? added 28 characters in body Oct26 revised Is it a wrong exercise in Pinter's Algebra? added 2 characters in body Oct26 asked Is it a wrong exercise in Pinter's Algebra? Oct17 comment Solving an exercise in Pinter's Abstract Algebra I still don't see how to show that for any $x \in H$, there is $y \in H$ such that $aya^{-1} = x$ (given that $aka^{-1} \in H$ for any $k \in H$). Oct17 revised Solving an exercise in Pinter's Abstract Algebra edited body Oct17 revised Solving an exercise in Pinter's Abstract Algebra edited body Oct17 asked Solving an exercise in Pinter's Abstract Algebra Oct4 awarded Popular Question Sep24 awarded Autobiographer Sep2 awarded Teacher Aug31 accepted Define finite ordered set using nested tuples Aug31 revised Define finite ordered set using nested tuples added 150 characters in body Aug28 comment Define finite ordered set using nested tuples @AsafKaragila: Baby Jech is "Introduction to Set Theory," when Papa Jech is "Set Theory." I have just coined this names :) Aug28 comment Define finite ordered set using nested tuples @AsafKaragila: You sound like you know where it is from (it is from Baby Jech). Actually I have to solve this problem, the author provides a long hint for this exercise. I didn't read the hint when I asked this question, but then I read it because I was confused. Or you want to say that if there is a hint, you must read it. I choose to try to solve a problem before reading the hint. Aug28 revised Define finite ordered set using nested tuples added 94 characters in body