Philosophy has five main branches: metaphysics, epistemology, ethics, politics, and esthetics. Metaphysics deals with the fundamental nature of existence; epistemology deals with the fundamental nature of man's means of knowledge and its role in understanding existence; ethics is the application of these two branches to how man ought to live; politics deals with how men ought to interact in a social context, including establishing a government; and esthetics deals with the role that art plays in presenting a philosophy in readily perceivable forms.
Along with the five main branches of philosophy, I have added a section for the special sciences (or applications).
Because these essays were not originally intended to be subdivided into philosophic categories, there is a lot of overlap in the writings.
The Possibility of Discovery (1998)
Math Lesson (1999)
Space and sight (2002)
Elementary Wave Theory (1998)
Physics and Philosophy (1998)
Relativistic Mass (1999)
3D Imaging Theaters (1999)
The Black Hole of Cosmology (1999)