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 Sep 15 revised Is it true or false : p↔q does not imply p→¬q? No need for the initial "I have a doubt" Sep 15 suggested approved edit on Is it true or false : p↔q does not imply p→¬q? Jun 8 revised Why do the equations $Ax + By + Cz= D$ represent planes in $\Bbb R^3$ and not lines? The previous edit messed the title. Jun 8 suggested approved edit on Why do the equations $Ax + By + Cz= D$ represent planes in $\Bbb R^3$ and not lines? May 24 answered Find all solutions in N of the following Diophantine equation May 24 comment Compute $\lim_{n \to \infty} \left(\frac{1}{\sqrt{n^3+1}} + \frac{1}{\sqrt{n^3+4}} + \cdots + \frac{1}{\sqrt{n^3+n^2}}\right)$ @GregoryGrant you need to correct the answer. (the $n / \sqrt{n^3+n^2}$ to $n / \sqrt{n^3}$) May 24 comment Compute $\lim_{n \to \infty} \left(\frac{1}{\sqrt{n^3+1}} + \frac{1}{\sqrt{n^3+4}} + \cdots + \frac{1}{\sqrt{n^3+n^2}}\right)$ @Gregory your inequality is wrong. $n / sqrt(n^3+n^2) > 1 / sqrt(n^3)$ May 9 suggested rejected edit on Math problems that are impossible to solve May 9 comment Math problems that are impossible to solve I agree with Gerry. I was considered a big surprise when - some thousands of years ago - they proved this, and therefore that there are irrational numbers. May 9 comment Simplify $\left(ab \sqrt[4]{a^{3}/\sqrt{b\sqrt{b}}}\right)^{2}$ 13 x 2 = 26 and 28 x 2 = 56. Where did the two 16 disappear into?. Apr 29 comment How to construct a product set whose complement is not a product set? Why not $A \times X \subset X \times X$ ? Apr 6 comment Is There any formula to calculate automorphism with the spesific graph? Dn x (Sk)^n where k = s-2 I'm not exactly sure about the group itself but the size of it is certainly 2n x (s-2)^n. Matches your 2x3x(3-2)^3=6 and 2x4x(3-2)^4=8 Apr 6 comment Is There any formula to calculate automorphism with the spesific graph? The group seems to be D4 x (S2)^4 Apr 6 comment Inequality involving Square Root The answer is correct but not the solution. Mar 26 comment Seeking guide for project. The "Knot Book" by Colin Adams is my favourite. You should definitely have a look at it if you can find it in the univ. library. Jan 18 comment Why do some other people use dek and el rather than letters as the eleventh and twelfth digits in the dozenal or duodecimal system? "deka" is the Greek word for ten. It looks closer to dek than decem. Dec 20 awarded Constituent Dec 18 comment Does this algorithm find prime numbers only? " for verifying that 147 is prime, ..."? The wording does not look appropriate, considering that 147 is not prime. Dec 13 comment Trisecting an angle and another +1 for the conclusion that you must have made a mistake. Dec 13 comment Trisecting an angle An initial 135 degrees angle would also demonstrate the problem quite well. The resulting 3 angles would not be 45 degrees and it's easy to check visually (adding 2 of them would not be equal to 90 degrees)