Task: Text Categorization
Input (English): In one work by this man, he rejects definitions of beauty as that which is appropriate, useful, or gives joy to hearing and sight. Another work by this author of Greater Hippias mentions a Sophist who claims "man is the measure of all things." Besides(*) Protagoras, he transcribed several speeches on love in the Symposium. Justice and the immortality of the soul are the subject of Crito and The Apology, which depict Socrates's trial and execution. For 10 points, name this philosopher who argues for his abstract forms and introduces his "cave" in The Republic.
Output (English): Social Science