User:Laopi52

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Academia PhDThis user has a Doctor of Philosophy degree in Mathematics. This user has published peer-reviewed articles in academic journals. prog-3This user is an advanced programmer. $e^{i\pi \ }$This user is a mathematician.

Wikipedia:Babel frCet utilisateur a pour langue maternelle le français. en-5This user can contribute with a professional level of English. de-2Dieser Benutzer hat fortgeschrittene Deutschkenntnisse. es-1Este usuario puede contribuir con un nivel básico de español. ru-1Этот участник владеет русским языком на начальном уровне. Search user languages

I am an old and active mathematician — "Laopi" means "old skin", or "old leather" in Chinese. I am the author of more than 100 research papers, mainly in algebra (group theory), low dimensional topology (theory of braids), and set theory (large cardinals).

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