Dear Professor Gao,

I've found some photos of Professor Wu in my late father's papers. Thought it might be interesting to Professor Wu's school. My father, Николай Николаевич Воробьев, was a well-known soviet game-theorist, and he visited China, I think, in the beginning of 1960 for joint research with Chinese mathematicians. In particular, he was talking to Professor Wu, who, of course, made a very significant contribution to game theory (a very general min-max theorem without convexity assumptions).

On the first picture there are two of them in an office in Mathematical Institute (the note on the back states that it is indeed Prof Wu). On the second picture, I can only guess that the third from the right in the bottom row is Wu, to the left of him is probably the famous number theorist Hua Loo-Keng (but I may be wrong), followed by my father.

All the best,

Nicolai Vorobjov

Dept. of Computer Science

University of Bath, UK

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