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Theorem 1(Erdos):**A mathematician is a device for turning coffee into
theorems.**

Theorem 2(Zhiqiang Xu): **Zhiqiang Xu is not a mathematician.**

Proof: Because my name is Zhiqiang Xu, we only need to prove "I am not a mathematician". After drinking a cup of coffe, I have a toothache. Hence, I can not think and then I can not prove anything. So, I can not turn a cup of coffee into a theorem. According to Theorem 1, I am not a mathematician.

Lecture 1 Weierstrass Theorem and Convolution Approximation

Lecture 4 Polynomial Interpolation

Lecture 5 Generalized Fourier Series

Lecture 6 B Spline Functions

Lecture 7 Box Spline Functions

Lecture 8 Wavelets，1

Lecture 9 Wavelets，2

Lecture 10 Wavelets，3

Lecture 11 Wavelets，4

Lecture 12 Wavelets，5