Philosophy:

A definition of philosophy by the American philospher Charles Peirce (1839 - 1914):

The theoretical science in three branches:

Phenomenology ascertains and studies the kinds of elements universally present at any time to the mind in any way
Normative science distinguishes what ought to be from what ought not to be
Metaphysics seeks to give an account of the universe of mind and matter

According to Peirce, modern philosophy has suffered a "tidal wave" of nominalism, beginning with Descartes.

Aspects of Peirce's philosophy: normative sciences between phenomenology and metaphysics.

His notions of nominalism, intuition, automation.

Normative sciences: esthetics, ethics (or practics), and logic.

Feeling, reaction, thought.