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 Dec17 comment When is a number square in Galois field p^n if it's not square mod p? Tough choice because the answers was very similar, but Bruno's answer did it a little better for me this time. But thank you too - I found your answer useful aswell :) Dec17 accepted When is a number square in Galois field p^n if it's not square mod p? Dec17 asked When is a number square in Galois field p^n if it's not square mod p? Dec8 awarded Caucus Jul2 awarded Curious Jun16 revised Collision detection between two accelerating spheres with no initial velocity? added 539 characters in body Jun16 answered Is a polynomial equation of degree $\ge 5$ not solvable by any way? Jun16 answered Collision detection between two accelerating spheres with no initial velocity? Jun3 awarded Yearling Jun1 comment Solution check: integral calculation using transformations I have $\sin^21$ as solution, but it's not clear to me how you solved this. Did you draw the area and find the integration limits? What were they? There is no wolframalpha-way to check if you don't have the limits... May20 answered Optimization of a Sum of Variables May20 comment Show that the converse of Fermats Little Theorem is false using a counter example. What is converdentto? May13 answered Continuous function is $0$ for all real number? May4 answered Can all triple integrals have their order rearranged? Apr28 answered Fuel and Oil Ratio Problem Apr23 comment Is it possible that “A counter-example exists but it cannot be found” No, I don't. I already pointed out that I'd say you can only imagine a single number at once i.e. in a Planck time. However, if you want to make this precise, you have to use numbers that have been described and ask to provide a counter-example. It's not that hard to define a described number - $n$ is a described number iff such written or told description has ever existed that the natural number $n$ fits it and no other natural number fits it. Apr18 comment Evaluate $\iiint xyz$ My bad, I agree with your result then :) Apr18 comment Evaluate $\iiint xyz$ @AméricoTavares I did not downvote but it seemed wrong. If we'd take shape where all coordinates are between 0 and 9 we can't get bigger than a cube with side length 9 which has a volume of 729. Apr18 comment Evaluate $\iiint xyz$ Integrate for $x$ from $0$ to $y$, then integrate for $y$ from $0$ to $z$ and finally integrate for $z$. The body is a triangular pyramid. Apr18 comment Is it possible that “A counter-example exists but it cannot be found” You can mathematically calculate upper limit for amount of possible imagined numbers, for example by using Planck time and size or something like that. Whatever you do, it's quite finite.