User:Rschwieb

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$e^{i\pi \ }$This user is a mathematician.

PhDThis user has a Doctor of Philosophy degree in Mathematics.

This user is a participant in
WikiProject Mathematics.

This user enjoys chess.

This user listens to industrial.

This user enjoys speedcubing and has a personal record of 0'0"45.

This user has been on Wikipedia for 18 years and 8 days.

Wikipedia:Babel

enThis user is a native speaker of the English language.

zh-2該用戶能以一般的中文進行交流。
该用户能以一般的中文进行交流。

py-2This user is an intermediate Python programmer.

Search user languages

WPM-Main WPM-Talk WPM-Desk /Bibliography /Cold storage

/Sandbox /GA Discussion /Physics notes /Requiring identity table

Interests

Ring and module theory, mathematical physics, representation theory, applications of abstract algebra.

Contributed stuff

Articles:

• Serial module, Uniform module, Dense submodule, Singular submodule, Hopfian object, minimal ideal, balanced module
• Hopkins–Levitzki theorem, Double centralizer theorem, Jacobson's conjecture
• Quasi-Frobenius ring, Semiprime ring, Kasch ring

Sections:

• superfluous submodule, finitely cogenerated modules
• full linear ring
• idempotent element

Also put serious effort into:

• Jacobson radical, Prime ideal, associated prime, Regular ideal
• Matrix ring
• Centralizer and normalizer
• Algebraic structure
• Irreducible ring

Random notes to self

• Contribute "trivial extension" material at dual number
• injective cogenerator, Morita duality
• Hopkins' theorem
• Maschke's theorem
• highlight differences of comm/noncomm on RT page
• maximal rings of quotients
• Dedekind finite ring
• /Read These, /Amusing
• /Algebraic structure copy
• LaTeX symbol tool link posted by Joel B. Lewis
• Berkeley MGSA

Questions

• Q1:In the Kissing number problem for three dimensions, I hadn't heard that there was extra space between the 12 spheres around the central sphere. Does anyone know if the radius of the surrounding spheres be uniformly increased so they are all mutually touching, while still touching the (unchanged) central sphere? If so what is this new radius?
• A1: If the radii of the surrounding spheres is r, then the central sphere has radius $r({\sqrt {1+\phi ^{2}}}-1)\,$.