Socrates:A classical Greek philosopher credited as one of the founders of Western philosophy, who often engaged in dialectical methods to explore ethical concepts and was Thrasymachus' opponent in the dialogues.
Justice: A central theme in philosophical discussions, especially in Plato's works, where it is often examined in relation to morality, societal structure, and individual behavior.
Dialectic: A method of argument for resolving disagreement that involves dialogue between two or more people holding different points of view about a subject; it is essential to the philosophical discussions in 'The Republic'.