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visits member for 2 years, 2 months
seen Aug 19 at 5:09

Jul
2
awarded  Curious
Jun
16
revised Collision detection between two accelerating spheres with no initial velocity?
added 539 characters in body
Jun
16
answered Is a polynomial equation of degree $\ge 5$ not solvable by any way?
Jun
16
answered Collision detection between two accelerating spheres with no initial velocity?
Jun
3
awarded  Yearling
Jun
1
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...
May
20
answered Optimization of a Sum of Variables
May
20
comment Show that the converse of Fermats Little Theorem is false using a counter example.
What is converdentto?
May
13
answered Continuous function is $0$ for all real number?
May
4
answered Can all triple integrals have their order rearranged?
Apr
28
answered Fuel and Oil Ratio Problem
Apr
23
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.
Apr
18
comment Evaluate $\iiint xyz$
My bad, I agree with your result then :)
Apr
18
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.
Apr
18
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.
Apr
18
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.
Apr
18
answered Is it possible that “A counter-example exists but it cannot be found”
Apr
18
comment Have I done something wrong in this integral?
@PPG Alright, now your calculations seem all fine to me.
Apr
18
answered Have I done something wrong in this integral?
Apr
18
comment Have I done something wrong in this integral?
You have to integrate over $[0 \le \theta < \pi]$ but you only have $f(\theta,\phi)$ for $[0 \le \theta < \pi/2]$?