a study of Aristotle's practical philosophy a study of Plato's political philosophy a study of Nietzsche's political philosophy a study of Vajda's political philosophy 公益与私利：亚里士多德实践哲学研究：a study of Aristotle's practical philosophy Study of Marx's political philosophy a study on Kant's moral philosophy a study of early German romantic philosophy History of political philosophy a study of Karel Kosik's philosophy
