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18h
comment Integrate area of function over a tetrahedron
The limits of the innermost integral are the limits of which variable?
21h
comment Why prove that area is unique?
What we're worried about is not that the area might not be unique, but that our inequalities might not be strong enough to nail it down. For example, one can easily show that the area must satisfy $0 < A < b^3$. Now by your logic, I could say that $b^3/2$ satisfies those inequalities, and the area is clearly unique, so we must have $A = b^3/2$.
21h
comment How many minimally sides are needed to fully enclose a volume in an $n$-dimensional spaece?
Excuse me, it's Bender Bending Rodríguez. :)
21h
comment convex relaxations
Actually, are you sure $\|x\|_2\|x\|_1$ is nonconvex?
21h
revised Total area for a natural nested set of convex polygons.
deleted 10 characters in body
1d
comment Is $e^x$ finite almost everywhere even though $\mathop {\lim }\limits_{x \to \infty } {e^x} = + \infty $?
I think that first "blah everywhere" should be "blah almost everywhere".
1d
comment Vibrating water container problem
This is a poorly designed problem. The water cannot jump up like that because below it there would be a vacuum. In real life the behaviour of water in a vertically oscillating container is surprisingly complicated.
1d
comment Maximization of sum of functions
If you say so. But the maximum can't be unique because $f(\alpha w)=f(w)$ for all $\alpha\ne0$.
2d
comment AX=B in Matlab solution
@Sridhar: Yes, see johndcook.com/blog/2010/01/19/dont-invert-that-matrix
2d
revised Is $e^{e^{2}}$ a relatively good approximation for $1000\phi$?
added 60 characters in body
2d
comment Maximization of sum of functions
Let $a=(1,0)$, $B=I_{2\times 2}$. Then $f(x,y)=x^2/(x^2+y^2)$ is concave in $(x,y)$?
2d
comment What is the highest number that can be got from 4383 by moving exactly 2 matches?
An LED-style 9 is supposed to have the bottom horizontal bar. What you have there looks more like a q.
2d
comment What is the value of $\lim_{x\to 0}x^x$?
No, $x\ln x\ne\ln x+1$.
2d
comment Are all interior points limit points in complex analysis?
The question in the title is different from the question in the post.
Jul
29
comment What is the formal negation of the statement “There is much X in Y”.
There isn't much X in Y.
Jul
28
comment Volume of partially filled spherical cap?
Duplicate of deleted question math.stackexchange.com/q/620661
Jul
28
revised Volume of partially filled spherical cap?
deleted 124 characters in body
Jul
28
comment How can I use the Bullet-Physics's ray-cast normal to calculate angles for a object to lay on a surface?
Does this previous post answer your question?
Jul
27
comment How can I use the Bullet-Physics's ray-cast normal to calculate angles for a object to lay on a surface?
So... you want to rotate the pizza so that its $z$ axis lies along the surface normal, is that right?
Jul
27
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