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 Apr6 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 Apr6 comment Is There any formula to calculate automorphism with the spesific graph? The group seems to be D4 x (S2)^4 Apr6 comment Inequality involving Square Root The answer is correct but not the solution. Mar26 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. Jan18 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. Dec18 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. Dec13 comment Trisecting an angle and another +1 for the conclusion that you must have made a mistake. Dec13 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) Dec8 comment Find value of sum of reciprocals of powers of a number @Wood or x=1 (instead of 0.5) Dec4 comment Why is it that $f(x)$ is even if $f(-x) = f(x)$? Definitions do not require proof. It's like baptizing. I baptized myself ypercube. Therefore ypercube is me. We baptized even functions all those functions f that satisfy f(x) = f(-x) for all x that f is defined. Nov20 comment How to find a general sum formula for the series: 5+55+555+5555+…? Shouldn't the summation be for k=0 up to n-1? Nov12 comment Open mathematical questions for which we really, really have no idea what the answer is @pew Added the link above. But he thinks that if we find a proof, it will probably be an existentiaal one, not an actual algorithm, useful in practical applications. Nov12 comment Open mathematical questions for which we really, really have no idea what the answer is For the record, Knuth said that he thinks P=NP is more plausible, in a recent interview: informit.com/articles/article.aspx?p=2213858 Nov7 comment Evaluate $\int_{-1}^{1} \exp(x+e^{x})\,dx$ You are fast ;) Nov7 comment Subgroups of Order $p^2$ in $\mathbb{Z}_p \oplus \mathbb{Z}_p$ You already say that the order of the group is $p^2$. So you have a bag with $X=p^2$ items. You take $X$ items and put them in another bag. How many ways to do this? Nov7 comment Examples of mathematical discoveries which were kept as a secret I'm not anything near an expert in math history but you are saying that we have no evidence of Fermat proving for example that $x^4+y^4=z^4$ has no solutions or any of the many theorems that carry his name? Nov7 comment Examples of mathematical discoveries which were kept as a secret Very interesting! Hidden by accident. Nov6 comment Reference request for unknown mathematical constant Using $\frac{1}{m(m+1)^2} = \frac{1}{m} - \frac{1}{m+1} - \frac{1}{(m+1)^2}$ Nov6 comment Does the A001921 linear recurrent integer sequence always yield composite numbers? Why you considered $a(64n+17)$ and not $a(64n+33)$? Nov6 comment Union of power sets of the counting numbers It's an infinite set that its elements are finite.