Philosophy is the study of general and fundamental problems, such as those connected with existence, knowledge, values, reason, mind, and language. Philosophy is distinguished from other ways of addressing such problems by its critical, generally systematic approach and its reliance on rational argument. The word "philosophy" comes from the Greek word philosophia, which literally means "love of wisdom.” In Sumbola, the philosophy genre is generally reserved for nonfiction works, but there is room for a fictional novels or short stories that deal with philosophical questions as their core theme. The introduction of the terms "philosopher" and "philosophy" has been ascribed to the Greek thinker Pythagoras. It is considered to be part of the widespread body of legends of Pythagoras of this time. "Philosopher" was understood as a word which contrasted with "sophist”. Traveling sophists or "wise men" were important in Classical Greece, often earning money as teachers, whereas philosophers are "lovers of wisdom" and not professionals. Some of the more important branches of the philosophy “tree” are: Metaphysics—the study of the most general features of reality, such as existence, time, the relationship between mind and body, objects and their properties, wholes and their parts, events, processes, and causation. Traditional branches of metaphysics include cosmology, the study of the world in its entirety, and ontology, the study of being. Logic—the study of the principles of valid inference and correct reasoning. The subject of logic has two broad divisions: mathematical logic (formal symbolic logic), and philosophical logic. Ethics or moral philosophy—the study of the best way to live. Aesthetics—the study of beauty, art, enjoyment, sensory-emotional values, perception, and matters of taste and sentiment.