User Shiquan Ren - MathOverflow Meta

Shiquan Ren

Member for 11 years, 2 months
Last seen more than 4 years ago

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lecturer & researcher

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Oct 9, 2022

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20

Every closed subset $E\subseteq \mathbb{R}^n$ is the zero point set of a smooth function

17

different definitions of Hopf algebras

16

How to prove a commutative, with unit, Noetherian ring $A$ only has finitely many minimal prime ideals via the following step?

16

Commuting matrices are simultaneously triangularizable

15

Homotopy groups of a wedge sum