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When is this rational function of exponentials actually rational-valued?

...Overflow and across the Stack Exchange network - Should I use... ...$endgroup$ – Thomas Andrews 8 mins ago - $begingroup$ @ThomasAndrews... ...Pacific" mean (Germany pre-WW1)?... ...- What did "The Emperor of the Atlantic greets the Emperor of the...

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Using complete graphs and a combinatorial proof, show $sum_{i=1}^{j}$ ${k_i}choose{2} $ $leq$ ${n}choose{2}$...

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What is wrong with this? (Euler's Identity)

...float variable from Python to Wolfram Kernel?... ...$endgroup$ – Dietrich Burde 25 mins ago - New Focus Styles &... ...- Why doesn't Israel withdraw from the territories occupied during...

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Projective closure of an affine variety of homogeneous polynomials

...I know that, in general, to find the projective closure of an affine...

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Two constructions of normalised chain complex from a simplicial abelian group

...Overflow and across the Stack Exchange network - How do I tell... ...if a shunt resistor is routed using the Kelvin method?... ...Pacific" mean (Germany pre-WW1)?... ...- What did "The Emperor of the Atlantic greets the Emperor of the...

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Why is my approach incorrect (threshold for Dice roll)?

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When $Bbb Z_n$ is a domain or field, i.e. $ab equiv 0 Rightarrow aequiv 0,$ or $,bequiv 0pmod{! n}$ and forms of zero divisors....

...Suppose $,ab equiv 0 pmod n,$ and $,0< n $ (so $nmid ab,... ...we may assume $b in B$ since $A(B,b) = AB,$ via $Ab = (I,a)b ... ...: abequiv 0,$ for $,a,bnotequiv 0. $ Let $,k =,$ additive...

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Let $Ain M_2(mathbb{Z})$ s.t. there is a positive integer $n$ satisfying $A^n=I_2$. Show that $A^{12}=I_2$....

...$endgroup$ – Brian Fitzpatrick May 11, 2015 at 22:24 - $begingroup... ...$ Alex, firstly, you must reduce the problem to the case $det(A)... ...Overflow and across the Stack Exchange network - Is OPT a "passport... ...Pacific" mean (Germany pre-WW1)?...

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Definition of a subsequences and intuition

matheducators.stackexchange.com > questions

How should I convince a student who proved $1=-1$

...$endgroup$ – Nick C Feb 24, 2020 at 16:01 - 1 $begingroup$ Since... ...How should I convince a student who proved $1=-1$ One of my high... ...$endgroup$ – Dan Christensen Mar 6, 2020 at 17:06 - $begingroup... ...$endgroup$ – Dan Christensen Mar 8, 2020 at 17:15 Obviously the...