12,026 reputation
21247
bio website
location
age
visits member for 2 years, 6 months
seen 1 hour ago

2d
reviewed Approve suggested edit on Normal Matrix Having all real eigen values is Hermitian
2d
accepted Normal Matrix Having all real eigen values is Hermitian
Aug
29
reviewed Approve suggested edit on Eigenvalues for the Sturm-Liouville boundary value problem
Aug
29
reviewed Approve suggested edit on Normal Matrix Having all real eigen values is Hermitian
Aug
29
asked Normal Matrix Having all real eigen values is Hermitian
Aug
22
comment $f:\mathbb{R}^2\to\mathbb{R}^2, f(x,y)=(x+2y+y^2+|xy|,2x+y+x^2+|xy|)$
Okay got it...,..
Aug
22
comment $f:\mathbb{R}^2\to\mathbb{R}^2, f(x,y)=(x+2y+y^2+|xy|,2x+y+x^2+|xy|)$
so $3$ and $4$ are true, and $1,2$ are false, but how to show $f$ is differentiable?
Aug
22
comment $f:\mathbb{R}^2\to\mathbb{R}^2, f(x,y)=(x+2y+y^2+|xy|,2x+y+x^2+|xy|)$
Yes Yes, they wanted which are the correct statements
Aug
22
asked $f:\mathbb{R}^2\to\mathbb{R}^2, f(x,y)=(x+2y+y^2+|xy|,2x+y+x^2+|xy|)$
Aug
21
comment On $f:A\to\mathbb{R}^2, f(x,y)=({x\over 1+x+y},{y\over 1+x+y})$
Oh Yes, I thought they are asking whether determinant of the Jacobian matrix vanishes, anyway the matrix also does not vanish on $A$
Aug
21
answered Multivariate limit $\lim_{(x,y) \to (0,0)} \frac{{x{y^2}}}{{{x^2} + {y^4}}} = 0$
Aug
21
revised On $f:A\to\mathbb{R}^2, f(x,y)=({x\over 1+x+y},{y\over 1+x+y})$
added 1 character in body
Aug
21
asked On $f:A\to\mathbb{R}^2, f(x,y)=({x\over 1+x+y},{y\over 1+x+y})$
Aug
16
comment Let $f:[-1,1] \to \mathbb{R}$ be differentiable 3 times, prove $\exists M>0 \ , \ s.t \ f(x) \le Mx^2$
Why $f'(0)=0$? Can you explain?
Aug
13
accepted $x_1,x_2,x_3,x_4$ are in Harmonic Progression $\Rightarrow (x_1-x_3)(x_2-x_4)=4(x_1-x_2)(x_3-x_4)$
Aug
13
asked $x_1,x_2,x_3,x_4$ are in Harmonic Progression $\Rightarrow (x_1-x_3)(x_2-x_4)=4(x_1-x_2)(x_3-x_4)$
Aug
9
accepted How to find the area of an isosceles triangle without using trigonometry?
Aug
9
asked How to find the area of an isosceles triangle without using trigonometry?
Aug
4
awarded  Notable Question
Jul
23
awarded  Popular Question