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C. Ding's user avatar
C. Ding's user avatar
C. Ding's user avatar
C. Ding
  • Member for 8 years, 4 months
  • Last seen more than a week ago
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7
No community promotion ads any longer?
Oct 27, 2023
6
Community Ads for 2021
Jun 23, 2021
2
Mathematics new site theme is live
Aug 10, 2018
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7
a counter-example for the existence of the direct limits in $\mathbf{Ban}$
6
If $AT=TA$ with $A\geq0$. Why $A^{1/2}T=TA^{1/2}$?
5
Dual space $X^*$ separates points of $X$
5
How to show $f$ is non-negative.
5
Show that continuous functions preserve sequence convergence in topological spaces