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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.
Jul
15
asked Is there any pythagorean triple (a,b,c) such that $a^2 \equiv 1 \bmod b^{2}$