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Ryszard Szwarc's user avatar
Ryszard Szwarc's user avatar
Ryszard Szwarc's user avatar
Ryszard Szwarc
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16
Does the limit of these sums converge/diverge?
Aug 4, 2023
14
Can $\ln$ be written as a ratio of polynomials?
Dec 7, 2023
12
Example of an algebra that is a Banach space but not a Banach algebra
Apr 22, 2022
12
Is this proof for divergence of harmonic series rigorous? Can it be made so?
Jan 21
10
Is there an infinite dimensional inner product space without an orthogonal Hamel basis?
Jun 6, 2023
10
Unbounded operator whose spectrum is the entire complex plane?
Mar 24
9
Operators similar to operators with spectral radius 1
Feb 6, 2022
9
Invertibility of a linear combination of self-adjoint operators
Dec 28, 2022
9
How to prove $\frac{\sqrt{5}+1}{2}>\log_23$?
Jun 7, 2023
9
How to solve functional equation $f(x^{2}) = \frac{f(x)}{1 + x}$?
Oct 30, 2023