What is Logic?

The term 'logic' comes from the Greek word 'logos,' which can mean word, discourse, or reason. In ancient Greek thought, 'logos' as reason had two interpretations: human reason and universal intelligence.

Logic is a major branch of philosophy that studies the correct processes of thinking or reasoning. It focuses on understanding how to reason accurately.

Firstly, 'logos' refers to human reason, which aims for an objective understanding of reality. Secondly, it refers to universal intelligence or a rational divine intelligence governing the cosmos. In the second sense, 'logos' is the light-giving principle that helps humans understand the universe.

When 'logos' is understood as human reason, it denotes the study or rationality of the human mind seeking objective understanding. When we use 'logos' to study something, like in 'psychology' (psyche + logos = study of the mind), we are using it in the first sense. Similarly, logic is the study of correct processes of thinking.

Studying correct thinking processes primarily involves dealing with arguments. Logic focuses on the principles that govern the validity of arguments, determining if a conclusion necessarily follows from its premises or assumptions.

The video provides examples of obviously valid arguments where the conclusion logically follows from the premises. For an argument to be valid, if the premises are true, the conclusion must also be true. More complex arguments require thorough analysis to determine their validity, which is the main concern of logic.