# user4140

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 Mar21 comment Putnam $\bf 2001$ problem A$\bf 1$ (Binary operation) I really don't understand it. Could you elaborate please? Mar21 comment Putnam $\bf 2001$ problem A$\bf 1$ (Binary operation) Why is $((b*a)*b)*(b*a)=b$??? Mar21 comment Putnam $\bf 2001$ problem A$\bf 1$ (Binary operation) what do you mean let $a=b*a$ Mar21 comment Putnam $\bf 2001$ problem A$\bf 1$ (Binary operation) yes, the only part I don't get is the second equivalence Mar21 comment Putnam $\bf 2001$ problem A$\bf 1$ (Binary operation) The solution in mathlinks says $((b*a)*b)(b*a)=b$ out of the blue. Why? Mar21 asked Putnam $\bf 2001$ problem A$\bf 1$ (Binary operation) Mar21 revised Solvable Group, which Quotients need to be Abelian? added 8 characters in body Mar21 comment Solvable Group, which Quotients need to be Abelian? Oh right... that should have been obvious, thanks. Mar21 comment Solvable Group, which Quotients need to be Abelian? How can I make the normal subgroup triangle? Mar21 asked Solvable Group, which Quotients need to be Abelian? Mar21 answered Prove that a set is finite Mar19 comment where can I take an online Second course in Linear Algebra or second abstract algebra? I don't understand, your plan isn't to take the class in your school, but rather take it online and validating it in you own school to let them graduate you? Mar19 answered How do you compute group cohomology in practice? Mar19 comment where can I take an online Second course in Linear Algebra or second abstract algebra? Is Aluffi's Algebra: Chapter 0 free to download, or has that changed? Mar19 answered where can I take an online Second course in Linear Algebra or second abstract algebra? Mar19 revised Linear algebra - product edited title Mar16 comment What are some alternatives to base number systems and their advantages? Yes, but that doesn¿t work as smoothly for all number in the range 366! and 365! So this method reduces length of large number while decreases number of symbols requfor small numbers, this is something a base system can't do Mar16 comment What are some alternatives to base number systems and their advantages? @moose I agree this particular system isn't a marvel, but for example: the number 6^1000-1 would take 999 digits in base 6. While it would take 365 in the one I proposed. Mar15 asked What are some alternatives to base number systems and their advantages? Mar15 answered If $\mathcal{P}(A)=\mathcal{P}(B)$, then $A=B$?