User:Zhangzk

Welcome to my Wikipedia user page. I am a Chinese mathematician interested in pages on mathematics, mathematicians, science, and culture. I joined Wikipedia on 25 March 2013.

該用戶的母語是中文。
该用户的母语是中文。

This user can contribute with a professional level of English.

Cet utilisateur peut contribuer avec un niveau intermédiaire en français.

Dieser Benutzer hat grundlegende Deutschkenntnisse.

PhD

This user has a Doctor of Philosophy degree.

e^{i\pi \ }

This user is a mathematician.

math-N

This user can contribute with fluent mathematical skills.

This user knows that math is $\int e^{xy}\,$ .

This user has a keen interest in mathematics.

${\frac {?}{0}}$

This user can divide by zero.

This user is interested in mathematics and curious about topology.

This user is interested in polyhedra.

Erdős 3

This user has an Erdős number of 3.

Pages that I started

NEWUOA (January 14, 2014, Coimbra, Portugal)
LINCOA (January 18, 2014, Coimbra, Portugal)
Derivative-free optimization (January 18, 2014, Coimbra, Portugal)
BOBYQA (February 14, 2014, Coimbra, Portugal)
TOLMIN (optimization software) (April 6, 2015, Toulouse, France)
Tolmin (disambiguation) (April 6, 2015, Toulouse, France)
UOBYQA (April 6, 2015, Toulouse, France)
International Day of Mathematics (March 15, 2020, Hong Kong, China)
PDFO (Powell's Derivative-Free Optimization solvers)
- English (April 14, 2020, Hong Kong, China)
- 中文 (May 30, 2020, Hong Kong, China)
- Deutsche (June 4, 2020, Hong Kong, China),
- Italiano (June 4, 2020, Hong Kong, China)
- Españo (June 4, 2020, Hong Kong, China)
Michael J. D. Powell (中文维基, July 7, 2020, Shenzhen, China)

Homepage of ZHANG Zaikun: zhangzk.net