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rednexela1941
  • Member for 7 years, 5 months
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5 votes
2 answers
879 views

Image of a closed set is closed under bounded linear transformation between Banach spaces?

3 votes
0 answers
104 views

Showing a function is constant given $f_{xx} + f_{yy} \geq 0$ on the domain.

3 votes
0 answers
258 views

Functional Derivative on Manifold?

3 votes
1 answer
466 views

$S^3 \times S^1$ is not a symplectic manifold?

2 votes
2 answers
104 views

Non-Reflexivity of $L^1$ by finding a particular operator in the dual space?

1 vote
1 answer
155 views

$C^\infty$ involution of Manifold and surjective local diffeomorphism give rise to an isomorphism?

1 vote
1 answer
260 views

Units of $\mathbb{Z}[\omega]$ where $\omega = \frac{1}{2} (1+ \sqrt{a})$, $a<0$ a square free integer.

1 vote
2 answers
563 views

$\mathrm{card}(\mathbb{Z}^n/M\mathbb{Z}^n) = |\det(M)|$? [duplicate]

1 vote
1 answer
602 views

Evaluating the integral $\int_0^{2\pi } e^{i\theta} e^{- i e^{i n \theta}} \: d\theta$ using contours.

1 vote
1 answer
414 views

Proof the the general Poincare Lemma $H^*(X \times \mathbb{R}) \cong H^*(X )$

1 vote
1 answer
1k views

Galois Group of splitting field of $x^4 - x -1$ over $\mathbb{Q}$?

0 votes
1 answer
281 views

$\liminf_{|x|\to \infty} |x f(x)| =0$ for a Lebesgue integrable function on $\mathbb{R}$

0 votes
1 answer
423 views

De Rham Cohomology of the open ball on $\mathbb{R}^n$

0 votes
1 answer
53 views

Existence of $h \in L^p$ function that satisfied $\int f(g-h) =0$ for $g$ measurable and $f \in L^q$

0 votes
1 answer
112 views

Proof of Riesz-Fischer Theorem using the completeness of $L^1$ to infer completeness of $L^p$.