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Jun
27
awarded  Nice Question
Jun
27
asked Basis for $l^{\infty}$
Jun
25
comment Find whats's wrong with this proof about the reflexive vector space
@BrianM.Scott I see. So what's way to form the basis in dual of vector space?
Jun
25
comment Find whats's wrong with this proof about the reflexive vector space
@TobiasKildetoft it can be written as $\sum_{\alpha}f_{\alpha}$
Jun
25
comment Find whats's wrong with this proof about the reflexive vector space
@TobiasKildetoft why it doesn't ?
Jun
25
asked Find whats's wrong with this proof about the reflexive vector space
Jun
24
revised The information the kernel provides about a linear map
added 254 characters in body
Jun
24
asked The information the kernel provides about a linear map
Jun
12
awarded  Nice Question
Jun
11
asked The inverse function theorem
Jun
2
awarded  Popular Question
May
15
reviewed Approve Integration of $\dfrac{x}{\sinh x}~dx$ from $-\infty$ to $\infty$
May
9
accepted Evaluate the angle between two curves at their intersection: $y=x^2+1, x^2+y^2=1$
May
9
accepted Sufficient condition for the block matrix $\big(\begin{smallmatrix} B & A^T \\ A & 0 \end{smallmatrix} \big)$ to be invertible
May
9
accepted The closed set in the product topology
May
9
accepted real root of $x^4-x^3\sin x-x^2\cos x$
May
9
accepted $\int_0^\pi g(\theta)\sin(\theta)\cos^n(\theta)\equiv 0$ imply $g(\theta)=0$?
May
9
accepted Lebesgue integrable discontinuity points
May
9
accepted The dimension of the operator if the domain has dimension 2
May
9
accepted Integrate $\int_0^\pi e^{-ik\cos\theta}\sin^2{\theta} \, \mathrm{d}\theta$