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2h
comment Compatibility of direct product and quotient in group theory
$(A\times B)/(A\times1)=B$?
3h
comment Fermat's last theorem and $\mathbb{Z}[\xi]$
There is a link to Lame's proof at math.stackexchange.com/questions/953462/what-was-lames-proof
3h
comment Fermat's last theorem and $\mathbb{Z}[\xi]$
There is a sketch of the proof you want at cs.uwaterloo.ca/~alopez-o/math-faq/mathtext/node9.html under the discussion of whether Fermat could have had a proof.
3h
comment Fermat's last theorem and $\mathbb{Z}[\xi]$
It's probably done in Harold M. Edwards' book, Fermat's Last Theorem: A Genetic Introduction to Algebraic Number Theory.
12h
comment Cover a cicular hole with planks
It appears that this was Tarski's proof. The paper by Bang, mentioned in my answer, solves a problem that includes the circle as a special case.
22h
comment A trick and interesting math SUM
You are meant to improve your question, not just post it over again.
23h
comment Can someone explain what independent linear equations are?
I'm voting to close this question as off-topic because OP is unresponsive.
23h
comment Does Tom catch Jerry?
In the 1st paragraph of the question, it says they run at the same speed.
1d
comment Graph Combinatorics: How many such Graphs are there?
OK. If you figure it all out, I encourage you to write it up and post it here as an answer.
1d
comment Does Tom catch Jerry?
What shape is the wall?
1d
comment How do you determine the form of the particular solution to a nonhomogeneous recurrence relation?
So, are you OK now?
1d
comment Graph Combinatorics: How many such Graphs are there?
So, find anything useful at those webpages?
1d
comment Conjugacy classes of the representatives
How you do those things depends on what you know about the group to begin with. You might enjoy rutherglen.science.mq.edu.au/ccooper/Groups/… and rutherglen.science.mq.edu.au/ccooper/Groups/…
1d
comment set of numbers, elementary set theory
Have you never seen numbers put on an axis?
2d
comment Calculate a determinant.
Subtract the first row from each of the others, looks like you get a matrix that should be easier to deal with as it's mostly zeros.
2d
comment set of numbers, elementary set theory
Incomprehensible. Please explain the problem to someone who can understand the math and who can express herself well in English, and have her show you how to pose the question.
2d
comment Minimum number of real multiplications to multiply two quaternions
If you can get the book Matters Computational by Jorg Arndt, quaternion multiplication is discussed on pp 818-819.
2d
comment Minimum number of real multiplications to multiply two quaternions
Now posted to MO, mathoverflow.net/questions/203759/…
2d
comment A miraculous number N
@Charles, you're right, of course. I may have been thinking of a result that's conditional on the Riemann Hypothesis.
Apr
23
comment How to test if these are a vector space and find the basis?
Though it's easier to check the axioms of a subspace.