- 1. From: Xxxxx Yyyyy
To: yzheng@math.psu.edu

Subject: help

Dear Professor Zheng,

I am a PhD student in MSIS dept of Smeal College. I am working on one

project recently which seems to be a problem of calculus of variation.

Unfortunately I had no background of this knowledge. Could you please help

me and give me some hint of how to solve this problem? Could I meet you to

discuss about it?

Thank you very much,

Xxxxx Yyyyy

Answer: Sure, can you come Thursday 9--10am?

- 2. From: John Smith
To: yzheng@math.psu.edu

Subject: a request

Dr. Zheng,

I am a faculty member in statistics at PSU, and recently I have

been trying to find a good reference for the "Spectral Theorem

for compact self-adjoint operators". A book would be

nice, as it is more or less self-contained. I found you

had some lecture notes on this, and wonder if you could

help.

thanks in advance,

John Smith

Answer: Yes, of course! ``Functional Analysis'' by K. Yosida,

Springer Verlag, Sixth edition, p319, should do.

--Yuxi

Problems? Send mail to yzheng@math.psu.edu

Updated: 11/5/2002