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Mar
21
comment Putnam $\bf 2001$ problem A$\bf 1$ (Binary operation)
I really don't understand it. Could you elaborate please?
Mar
21
comment Putnam $\bf 2001$ problem A$\bf 1$ (Binary operation)
Why is $((b*a)*b)*(b*a)=b$???
Mar
21
comment Putnam $\bf 2001$ problem A$\bf 1$ (Binary operation)
what do you mean let $a=b*a$
Mar
21
comment Putnam $\bf 2001$ problem A$\bf 1$ (Binary operation)
yes, the only part I don't get is the second equivalence
Mar
21
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?
Mar
21
asked Putnam $\bf 2001$ problem A$\bf 1$ (Binary operation)
Mar
21
revised Solvable Group, which Quotients need to be Abelian?
added 8 characters in body
Mar
21
comment Solvable Group, which Quotients need to be Abelian?
Oh right... that should have been obvious, thanks.
Mar
21
comment Solvable Group, which Quotients need to be Abelian?
How can I make the normal subgroup triangle?
Mar
21
asked Solvable Group, which Quotients need to be Abelian?
Mar
21
answered Prove that a set is finite
Mar
19
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?
Mar
19
answered How do you compute group cohomology in practice?
Mar
19
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?
Mar
19
answered where can I take an online Second course in Linear Algebra or second abstract algebra?
Mar
19
revised Linear algebra - product
edited title
Mar
16
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
Mar
16
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.
Mar
15
asked What are some alternatives to base number systems and their advantages?
Mar
15
answered If $\mathcal{P}(A)=\mathcal{P}(B)$, then $A=B$?