Every honest researcher I know admits he's just a professional amateur. He's doing whatever he's doing for the first time. That makes him an amateur. He has sense enough to know that he's going to have a lot of trouble, so that makes him a professional.
by Charles Franklin Kettering (1876-1958) U. S. Engineer and Inventor

Ba truyện cổ tích toán học (e-book)

“If you want your children to be intelligent, read them fairy tales. If you want them to be more intelligent, read them more fairy tales.” ― Albert Einstein

E-book: Ba truyện cổ tích toán học

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