Philosophy is about as broad a subject as one can find in a university curriculum.
Philosophy includes the examination of its own methods, and its own history. It also falls within philosophy to examine the methods and practices of virtually all academic disciplines. Because of this breadth, a person can study philosophy in ways involving the styles and techniques of thought of most other fields of inquiry. For example, the work of a philosopher concentrating in logic is much like that of the student of mathematics. A philosopher primarily interested in the philosophy of religion will often be doing much the same things as a theologian or a student of the history of religion.