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Dec
26
comment How to check if a point is inside a rectangle?
Excellent answer.
Dec
6
comment Subscript in maximum notation
If you found the answer to be correct and helpful, you might want to accept it by clicking the "Right" sign besides the answer. :-)
Dec
4
comment Properties about Matrices that can be proved by only using Block Multiplication of Matrices
@joriki yes, I rewrote the sentence. I hope this formulates my problem better.
Dec
4
revised Properties about Matrices that can be proved by only using Block Multiplication of Matrices
deleted 193 characters in body
Dec
4
asked Properties about Matrices that can be proved by only using Block Multiplication of Matrices
Dec
1
awarded  Popular Question
Nov
26
comment Compute $\lim_{n\to\infty}(n-(\arccos(1/n)+\cdots+\arccos(n/n)))$
That the error part decreases as $1/N^2$ is decisive for the proof. Nice. :-)
Nov
17
revised Is memory unimportant in doing mathematics?
added 257 characters in body
Nov
17
answered Is memory unimportant in doing mathematics?
Nov
15
comment Information on the sum $\sum_{n=1}^\infty \frac{\log n}{n!}$
@did Sorry, you misunderstood me. I wanted to ask the reason for your comment "What is the meaning of "play with formulas equivalent to the original question and bringing no new information nor understanding to it"? "
Nov
15
comment Information on the sum $\sum_{n=1}^\infty \frac{\log n}{n!}$
@did Complete noob here. So may I ask you to explain why the two formulas are equivalent? I have got a suspicion it is so because it is basically just replacing formulas with numbers? Am I correct? For example, is this similar to saying that $\sum_{n=0}^\infty \frac{1}{n!} = e$?
Nov
15
accepted $I_m - AB$ is invertible if and only if $I_n - BA$ is invertible.
Nov
15
comment $I_m - AB$ is invertible if and only if $I_n - BA$ is invertible.
This is how I did the problem the first time, but then I forgot how I did it and was stuck. :P Thanks :-)
Nov
15
comment $I_m - AB$ is invertible if and only if $I_n - BA$ is invertible.
Thank you for another nice answer.
Nov
15
comment $I_m - AB$ is invertible if and only if $I_n - BA$ is invertible.
Thank You. It makes the proof quite obvious now. :D
Nov
15
asked $I_m - AB$ is invertible if and only if $I_n - BA$ is invertible.
Nov
14
comment Is this $SL_3(\mathbb{F_2})$ look like?
@sos440 +1 for the complete list
Nov
5
awarded  Revival
Nov
3
comment How many decimal places are needed for incremental average calculation?
@JernejJerin If you are satisfied with the answers, you might consider accepting them, else you might want to indicate what more information you want.
Oct
29
comment Good problem book on Abstract Algebra
I unaccepted your answer and instead accepted Dedalus's answer since on retrospective, I have found some of the book Exercise in Algebra and other books a more concentrated source of problems. I hope you don't mind.