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Apr
8
comment Riddle: 1 question to know if the number is 1, 2 or 3
Since the girl knows EVERYTHING about number 1, she knows if the boy is thinking to that number...
Apr
7
awarded  Necromancer
Apr
6
asked Nice application of fixed point theorems
Mar
14
answered Help understanding the proof for the infinity case of L' Hopital's Rule.
Mar
14
revised Prove that $ n^2$ tends to infinity as $n$ tends to infinity
added 6 characters in body
Mar
14
answered A 'different' explanation to “Supremum”
Mar
14
answered Prove that $ n^2$ tends to infinity as $n$ tends to infinity
Feb
18
comment Uniform convergence and bounded increasing function.
Take the functions $f_n(x) = |\sin n| x$. These are increasing functions which do not converge as $n\to \infty$.
Feb
15
revised Proving that lines from any vertex of a parallelogram to the midpoints of the opposite sides trisect a diagonal
added 64 characters in body
Feb
15
answered Proving that lines from any vertex of a parallelogram to the midpoints of the opposite sides trisect a diagonal
Feb
14
answered Proof that the $\lim\limits_{x \to 2}\dfrac{1}{x} = \dfrac{1}{2}$ using the $\epsilon$-$\delta$ definition of limits (verification).
Feb
7
revised Can we define the concept of limit without a topology?
translation
Feb
7
answered Question about non conservative vector field
Feb
7
comment Question about non conservative vector field
They don't speak at all... so they are not conversative
Feb
5
answered Prove that $\ln x$ is not uniformly continuous on $(0,1]$
Feb
3
comment Is $f(x,y)$ differentiable at the origin?
What is $f'(0,a)$ when $a$ is a vector?
Feb
3
answered Is $f(x,y)$ differentiable at the origin?
Feb
3
awarded  Revival
Feb
2
revised Binary search tree. Counting.
deleted 1 character in body
Feb
2
answered Let $g: [a, b] \rightarrow \mathbb R$ integrable and $g \ge 0 $. If $\int_a^b g = 0$