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18h
comment What is the determinant of the sum of a diagonal matrix and a matrix of ones?
@HagenvonEitzen When exactly one entry in the diagonal is $1$, the result is $\prod_i(a_{ii}-[a_{ii}\neq1]),$ where $[p]$ is the Iverson bracket. If more than one entry is $1$, the result is $0$.
20h
comment What is the determinant of the sum of a diagonal matrix and a matrix of ones?
@deinst I think that covers it. Would you mind copying the relevant part of that answer into an answer to this question so I can mark this as accepted? I can do this myself, too, if you don't want to.
20h
revised What is the determinant of the sum of a diagonal matrix and a matrix of ones?
Get rid of a pesky typo
20h
asked What is the determinant of the sum of a diagonal matrix and a matrix of ones?
Apr
11
accepted Is there a totally ordered set we can map any other totally ordered set to?
Apr
11
comment How to prove that $\lim\limits_{x\to0}\frac{\sin x}x=1$?
While this is indeed an interesting approach, integrals haven't been taught at the point where this limit is proved. Thank you for your answer though.
Mar
24
awarded  Notable Question
Mar
23
comment What is the lower bound for an algorithm that reconstructs a permutation?
I fixed a couple of typos. I'm sorry if that changes your answer.
Mar
23
revised What is the lower bound for an algorithm that reconstructs a permutation?
fix typos
Mar
23
asked What is the lower bound for an algorithm that reconstructs a permutation?
Mar
13
awarded  Famous Question
Mar
13
revised How to prove that $\lim\limits_{x\to0}\frac{\sin x}x=1$?
formatting.
Mar
13
comment How to prove that $\lim\limits_{x\to0}\frac{\sin x}x=1$?
Indeed, it's easy to see that this holds if one uses a series, but this question starts on the prerequisite that one does not use a series.
Mar
13
suggested approved edit on How to prove that $\lim\limits_{x\to0}\frac{\sin x}x=1$?
Mar
4
awarded  Great Question
Mar
3
comment Is there a totally ordered set we can map any other totally ordered set to?
I edited the question because I thought that the case $|O|=|\mathbb N|$ might be interesting, too. Thank you for researching this!
Mar
3
comment Is there a totally ordered set we can map any other totally ordered set to?
@AndresCaicedo Thank you. I'll see if my university's library has that.
Mar
3
revised Is there a totally ordered set we can map any other totally ordered set to?
added 2 characters in body
Mar
3
asked Is there a totally ordered set we can map any other totally ordered set to?
Jan
1
awarded  Yearling