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Apr
7
asked Compact operators are orthogonally equivalent to a diagonal matrix?
Mar
23
asked Weak-* bounded, closed convex set is compact?
Mar
14
asked The set of curves of degree $d$ with two singular points or a degenerate singular point is closed?
Mar
1
asked On the Banach–Alaoglu theorem: is the unit ball of an equivalent norm also weak-* compact?
Feb
19
asked A function of which $n(x)$-times derivative vanashes for all $x$ is a polynomial?
Jan
18
asked Minimal cyclotomic field containing a given quadratic field?
Dec
23
answered Any left ideal of $M_n(\mathbb{F})$ is principal
Dec
22
asked (Co)different ideal is divisorial?
Dec
17
asked Tychonoff's theorem for products of finite discrete topologies?
Dec
15
asked Extending Morse-Smale pair from submanifolds?
Nov
28
asked Understanding Bell's inequality vs. quantum mechanics
Nov
22
asked Cauchy-Lipschitz (or Picard-Lindelöf) theorem for Banach spaces?
Nov
21
answered Evaluating integral using invalid substitution
Nov
20
answered Show that $\{f_n \} \to f$ in $L^p(E)$ iF $\{f_n\}$ belongs to and is bounded as a subset of $L^{p+\theta} (E)$.
Nov
19
asked Can a smooth vector-valued function approximated by functions taking value in a dense subspace?
Nov
11
asked Gårding's inequality for $\mathbb R^n$ implies that for bounded smooth domains?
Nov
10
asked Methods to show that an ideal isn't principal in a quadratic number field?
Nov
5
asked Diagonalizing operators with the aid of wave packet transformation?
Oct
21
asked How does the determinant change with respect to a base change?
Aug
2
asked Algebraic methods to compute the cohomology ring of the complex topology of a variety?