1,526 reputation
410
bio website cse.iitb.ac.in/~aruniyer
location India
age 30
visits member for 2 years, 3 months
seen 6 hours ago

Dec
31
comment Relation between convex set and convex function
$\phi(\lambda x + (1 - \lambda)y)=\inf_{a\in A}\|\lambda x + (1 - \lambda)y-a\|$. Think of how you can play around with RHS. Note that, $\lambda a + (1 - \lambda) a = a$.
Dec
3
comment Proving by induction that $1+\frac{1}{2}+\frac{1}{3}+…+\frac{1}{n}\le\frac{n}{2}+1$ holds for all $n \ge 1$
?? Haven't they simply added 1/n+1 to both sides of the hypothesis statement. Why is it so magical to you?
Nov
24
comment $ \begin{bmatrix} -2 & 5 & 4 \\-1 & 0 & 0 \\0 & 4 & 3 \end{bmatrix}^{2013}$ =?
Sure, give me sometime and I will actually do it and write it up. Do you want me to? My point that it was doable precisely because it is a special matrix.
Nov
24
answered $ \begin{bmatrix} -2 & 5 & 4 \\-1 & 0 & 0 \\0 & 4 & 3 \end{bmatrix}^{2013}$ =?
Sep
15
answered Finding the equation of a circle ?
Sep
10
comment Support of a vector
support of a vector is the number of non-zero elements in that vector.
Sep
6
comment What is the difference between commutatitivity and distributivity?
No, nothing to add. Hurkyl (+1), pretty much has said everything I wanted to convey.
Sep
6
comment What is the difference between commutatitivity and distributivity?
Do you understand my question? Given two operators A and B, AB = A(B(x)). Unless B's range is A's domain, A(B(x)) does not make sense. Similarly, BA = B(A(x)) therefore, A's range has to be B's domain. Finally, for AB = BA to be true, A's range has to be same as B's range. Thereby, unless you define A and B's domain and range, you cannot talk about commutativity. That is why, I asked you, please write the domain and range of the two operators that you speak. Then we can think about commutativity.
Sep
6
comment What is the difference between commutatitivity and distributivity?
Please define the domain and range of your operators A and $\sum$. Without that, talking about commutativity is pointless.
Aug
30
revised Prove that the CDF of a random variable is always right-continuous
fixing some braces
Aug
30
suggested suggested edit on Prove that the CDF of a random variable is always right-continuous
Aug
30
revised is $\{(x,y) : x,y \in \mathbb{Z} \}$ a closed set?
Just using prettier norm notation :-)
Aug
30
suggested suggested edit on is $\{(x,y) : x,y \in \mathbb{Z} \}$ a closed set?
Aug
27
comment Counting Question
Choose the even number first, then select the other numbers.
Aug
27
comment Reproducing Kernel Hilbert Spaces for Dummies
That's pretty much what it seems to be if I read that paragraph in the paper correctly.
Aug
27
answered Let E = $\{x\in \mathbb{Q}: x>0$ and $x^2 <2\}$. Prove E does not have a largest element.
Aug
25
comment How to show that $\{\sqrt m - \sqrt n : m,n \in \mathbb N\}$ is dense in $\mathbb R$?
math.stackexchange.com/questions/275047/…
Aug
25
comment solving equations by the method of elimination
@rahul, now multiply throughout by $6x(x+1)$, what do you get?
Aug
25
comment solving equations by the method of elimination
@rahul, are you sure your final equation is correct? Please check your equations again.
Aug
25
revised solving equations by the method of elimination
fixing equations and some text