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Top Questions
10
votes
Invertibility of a linear combination of self-adjoint operators
linear-algebra
functional-analysis
asked Dec 28, 2022 at 9:05
math.stackexchange.com
9
votes
Operators similar to operators with spectral radius 1
functional-analysis
operator-theory
spectral-radius
asked Feb 6, 2022 at 8:44
math.stackexchange.com
5
votes
Square summability of sequences of the form $\int_0^1 f(x)x^n\,dx$
linear-algebra
functional-analysis
asked Mar 21, 2022 at 10:14
math.stackexchange.com
5
votes
Weak convergence of positive operators in Hibert space
functional-analysis
operator-theory
asked May 24, 2022 at 11:59
math.stackexchange.com
Top Answers
16
Does the limit of these sums converge/diverge?
math.stackexchange.com
15
Can $\ln$ be written as a ratio of polynomials?
math.stackexchange.com
12
Example of an algebra that is a Banach space but not a Banach algebra
math.stackexchange.com
12
Is this proof for divergence of harmonic series rigorous? Can it be made so?
math.stackexchange.com
10
Unbounded operator whose spectrum is the entire complex plane?
math.stackexchange.com
10
How to prove $\frac{\sqrt{5}+1}{2}>\log_23$?
math.stackexchange.com
10
Is there an infinite dimensional inner product space without an orthogonal Hamel basis?
math.stackexchange.com
9
How to solve functional equation $f(x^{2}) = \frac{f(x)}{1 + x}$?
math.stackexchange.com
8
Let $A$ be a symmetric $n \times n$ matrix. Prove that $A$ and $A^5$ have the same null space.
math.stackexchange.com
8
Is there an orthonormal set of polynomials whose derivatives are orthogonal?
math.stackexchange.com
8
Minimizing $\frac{\|p\|_2^2}{\|p\|_\infty}$ for probability vector $p$
math.stackexchange.com
8
Example of an inner product space with no orthonormal basis
math.stackexchange.com
7
Projection with same rank
math.stackexchange.com
7
calculate $\lim_{n\to\infty} {\frac{\binom{n^2-n}{n}}{\binom{n^2}{n}}}$
math.stackexchange.com
7
Does there exist a sequence such that $\lim_{n\to\infty} \{(-1)^na_n^2\}=1$, $\{x\}$ is the fractional part of $x$
math.stackexchange.com
7
Proof that $\cos(t^2)$ is not periodic
math.stackexchange.com
7
Proof: How many continuous/bounded functions on $[0,1]$ verify $f(x)=f(x/2)\frac{1}{\sqrt{2}}$?
math.stackexchange.com
7
$\lim_{n\to\infty}\left\{n\sum_{k=1}^n\frac{1}{k^5}\right\}$
math.stackexchange.com
7
Is the best degree $n$ polynomial approximation an interpolation on $L^2[0,1]$?
math.stackexchange.com
7
Shortcut for computing $ \lim_{x \to 0^+} \frac{1}{2x}\int_0^x \ln(t)t^2\,dt $
math.stackexchange.com
7
What is the limit of this sequence $a_n = (\frac{2n^2-2}{2n^2+3})^n$?
math.stackexchange.com
7
How do I show $\frac{2n+1}{2n+2} \le \frac{\sqrt{n+1}}{\sqrt{n+2}}$ for $n \ge 1$?
math.stackexchange.com
7
How can I show that $l^p$ has empty interior in $l^2$?
math.stackexchange.com
7
Is the space of compact linear operators on a separable Banach space separable?
math.stackexchange.com
7
Uniqueness of the extension in Hahn-Banach
math.stackexchange.com
7
Set of Injective Bounded Linear Operators with Closed Image is Open Subset of $L(X,Y)$ wrt Norm Topology
math.stackexchange.com
7
The Volterra Operator and the distance between a point and its range
math.stackexchange.com
6
Convergence analysis of a quotient of two sequences $x_{n+1}^2 = x_n^2 + \frac{c}{x_n^2}$.
math.stackexchange.com
6
If $a_1>1, a_{n+1} = 1+ \frac{a_n}{1+a_n}$, does $a_{n}$ converge?
math.stackexchange.com
6
Why is it that $1-1+1-1+... \not = \frac{1}{2}$?
math.stackexchange.com
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