Mathematical disciplines

Question

Once I spoked to a mathematician about mathematics and he asked me what was my favourite area in Maths. My answer was "Chaos Theory" and he said this is not a discipline in Mathematics.

What is a correct answer to such a question?

Answer 1

For some listing of areas of mathematics:

• The Mathematics Subject Classification is jointly maintained by the American Mathematical Society and the Zbl. A more lay-friendly guided tour of the classification scheme is available here.
• Another classification scheme is that used by the mathematics arXiv. The administrators there explain why they don't use MSC.