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 Dec 10 awarded Notable Question May 21 comment puzzle for Vietnamese eight-year-olds @DavidK thanks, I searched but would have never guessed that title (or those tags) May 21 comment A 3rd grade math problem: fill in blanks with numbers to obtain a valid equation that's incorrect, there are 136 solutions ... someone clearly didn't pay attention to floating operations ... here is a python script - repl.it/oxA/7 May 21 revised puzzle for Vietnamese eight-year-olds added 76 characters in body May 21 comment puzzle for Vietnamese eight-year-olds To be honest, I'm more interested in a possible way to approach it than speculating about the role of the snake ... May 21 revised puzzle for Vietnamese eight-year-olds fixed the number of solutions May 21 asked puzzle for Vietnamese eight-year-olds May 7 comment 'Obvious' theorems that are actually false Isn't this analoguous to that an integral from a to a of an integrable f for 0 < a < 1 must be > 0 if the integral of f from 0 to 1 is non-zero? Sep 30 awarded Popular Question Aug 9 awarded Popular Question Jul 2 awarded Curious Jun 5 answered 'Obvious' theorems that are actually false Jan 21 accepted Is there any pythagorean triple (a,b,c) such that $a^2 \equiv 1 \bmod b^{2}$ Jul 22 comment Is there any pythagorean triple (a,b,c) such that $a^2 \equiv 1 \bmod b^{2}$ awesome - thank you! Jul 18 awarded Nice Question Jul 16 comment Nature of a triangle with vertices $z_1, z_2$ and $-1$ such that $|z_1|=|z_2|=1=z_1+z_2$ |z1|=|z2|=1 means that z1 and z2 lie on the unit circle. z1+z2=1 means that the imaginary parts cancel out - i.e. z1 and z2 lie on a vertical line - so what do the real parts have to be? Jul 16 comment How many real roots does $(x-a)^3+(x-b)^3+(x-c)^3$ have? yeap, that's the key, and all that is needed Jul 16 awarded Teacher Jul 15 comment Is there any pythagorean triple (a,b,c) such that $a^2 \equiv 1 \bmod b^{2}$ sweet, I did see the second equation but had no idea how to use it Jul 15 answered Pigeonhole principle: show that a class of nine has at least five male or five female students.