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New posts in banach-algebras
If $X$ is an infinite-dimensional Banach space and $u\in B(X)$ ,then $\bigcap_{v\in K(X)}\sigma(u+v) =\cdots$
operator-theory
banach-algebras
Why is $GL(B)$ a Banach Lie Group?
functional-analysis
banach-spaces
banach-algebras
Uniqueness of the involution on a $C^*$-algebra
functional-analysis
banach-algebras
c-star-algebras
Reference request: Fourier and Fourier-Stieltjes algebras
reference-request
functional-analysis
harmonic-analysis
locally-compact-groups
banach-algebras
Proof of Gelfand formula for spectral radius
functional-analysis
spectral-theory
banach-algebras
Maximal ideals and maximal subspaces of normed algebras
examples-counterexamples
operator-algebras
banach-algebras
Spectrum $\sigma(a)$ taken within the unitisation of a $C^*$-algebra
functional-analysis
operator-algebras
spectral-theory
c-star-algebras
banach-algebras
Looking for an easy lightning introduction to Hilbert spaces and Banach spaces
functional-analysis
reference-request
operator-theory
self-learning
banach-algebras
Derivation into dense ideal of Banach algebras
operator-algebras
harmonic-analysis
banach-algebras
amenability
Trouble with the proof of Proposition 4.3.18 of Pedersen's Analysis Now
general-topology
functional-analysis
banach-spaces
c-star-algebras
banach-algebras
ideals, projections and factors in VN algebras
real-analysis
functional-analysis
c-star-algebras
banach-algebras
von-neumann-algebras
strictly positive elements in $C^*$-algebra
banach-algebras
c-star-algebras
On the spectrum of the sum of two commuting elements in a Banach algebra
abstract-algebra
functional-analysis
banach-algebras
Liouville's theorem for Banach spaces without the Hahn-Banach theorem?
complex-analysis
functional-analysis
banach-spaces
banach-algebras
Operator Exponential $e^A e^B = e^{A+B}$
functional-analysis
banach-spaces
banach-algebras
matrix-exponential
Prove that $\sigma(AB) \backslash \{0\} = \sigma(BA)\backslash \{0\} $
functional-analysis
banach-spaces
operator-theory
banach-algebras
Closure of the invertible operators on a Banach space
functional-analysis
banach-spaces
operator-theory
banach-algebras
If $\Phi$ is injective, $X_1$ normal and Hausdorff and $X_2$ compact, then $F$ is surjective
general-topology
banach-algebras
Is there an algebraic homomorphism between two Banach algebras which is not continuous?
functional-analysis
set-theory
operator-algebras
banach-algebras
Understanding Riesz's functional calculus
functional-analysis
banach-spaces
banach-algebras
functional-calculus
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