New posts in operator-theory

What are the Eigenvectors of the curl operator?

functional-analysis operator-theory eigenvalues-eigenvectors

Does the identity $\cos^2(x)+\sin^2(x)=1$ hold in a unital Banach algebra where $1$ is the unit?

functional-analysis analysis trigonometry operator-theory

When is an operator on $\ell_1$ the dual of an operator on $c_0$?

sequences-and-series functional-analysis operator-theory banach-spaces

If the expectation $\langle v,Mv \rangle$ of an operator is $0$ for all $v$ is the operator $0$?

linear-algebra vector-spaces operator-theory hilbert-spaces quantum-mechanics

Criteria of compactness of an operator

functional-analysis operator-theory hilbert-spaces compact-operators

Convergence of $A_nT$ to $AT$ in operator norm for compact $T$

functional-analysis convergence-divergence operator-theory compact-operators

Given $S \in B(Y^{*}, X^{*})$, does there exist $T\in B(X,Y)$ such that $S=T^{*}$?

functional-analysis operator-theory banach-spaces

Blackwell's condition for a contraction: Why is boundedness neccessary?

proof-verification operator-theory fixed-point-theorems

How to show the solution so this Fredholm integral is unique?

functional-analysis measure-theory operator-theory integral-equations

operator exponential

matrices operator-theory

Let $b=(b_n)$ be a real sequence, suppose that for any $a\in\ell^2$, $\sum_j a_j b_j<\infty$, then $b\in\ell^2$. [duplicate]

functional-analysis operator-theory

Show that $(x_n)$ is in $\ell^2$

functional-analysis operator-theory

Renorming $\mathcal{B}(\mathcal{H})$?

functional-analysis banach-spaces operator-theory operator-algebras von-neumann-algebras

Is the product rule true in a Banach algebra?

functional-analysis operator-theory banach-algebras functional-calculus semigroup-of-operators

Why does exponentiating the derivative yield the shift operator?

calculus operator-theory lie-groups lie-algebras operator-algebras

Fredholm operator norm

real-analysis analysis functional-analysis operator-theory normed-spaces

Integral representation for $\log$ of operator

integration operator-theory quantum-field-theory

Spectrum of the derivative operator

functional-analysis operator-theory normed-spaces spectral-theory

$ U $ is self-adjoint then $\|U\|= sup_{\|x\|\leq 1} |<Ux,x>|.$ [duplicate]

functional-analysis operator-theory

Spectral radius of the Volterra operator

functional-analysis operator-theory spectral-theory spectral-radius