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Ulysse Keller's user avatar
Ulysse Keller's user avatar
Ulysse Keller's user avatar
Ulysse Keller
  • Member for 2 years, 1 month
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  • Zurich, Switzerland
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Born 1943 in Lausanne, I am a bilingual person F-D with mother tongue (Swiss-) German (dialect) but preferring French language. English is a foreign language for me, so I might not always find the right words in it. I have been an informatician for 38 years and have a math. degree (F: licence ès sciences math.)... My math. interests are on all basics up to advanced level themes. For me, the literature of the group N. Bourbaki is often best choice, but not always. Currently I am self-studying Fourier series / transformation in Y. Katznelson's book on Harmonic Analysis

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3
How does one prove that partial functions of measurable functions of 2 var. are nearly all measurable?
Apr 3, 2023
3
Is there a short proof of the Second Mean Value Theorm for Integrals (strong, preferably asymmetric version)
May 26
2
Problems with the exact formal definition of the Brauer group of a field [duplicate]
Jan 26, 2023
1
Has anyone an example of a linear contin. operator T of a Hilbert space on C with a residual spectral value c for which T-c.Id has unbounded inverse?
Nov 16, 2022
1
Integration of periodic functions on the real line with respect to the Haar measure of 1-dim. torus
Aug 7, 2023
1
How to show that an absolutely continuous increasing real function is an indefinite integral of an L1 function
Nov 26, 2023
1
Why is this set of functions compact in L^1 (in proof of localization principle by Katznelson)
Jun 8
1
Product notation in partial differentiation
Jun 11, 2022
1
Interpretation of the double integral over a region
Jun 11, 2022
1
Has anyone an example of a linear contin. operator T of a Hilbert space on C with a residual spectral value c for which T-c.Id has unbounded inverse?
Nov 17, 2022