He was getting old and found it more difficult to work on mathematics.

He was also the author of several books and papers on mathematics.

Along with it had come several other courses on mathematics and she was working her way through those at the same time.

He doesn't know from nothing about anything, but he's nuts on mathematics.

He has written around 40 books on mathematics and computer programming.

"I work on mathematics because of its great beauty," he said.

He also wrote a couple of books on mathematics, but with secondary importance.

It remains one of the most popular books on pure mathematics.

He had a great impact on mathematics, theory of music and astronomy.

An emphasis is placed on teaching English, science, mathematics and physical education.