الفلسفة الماركسية
Althusser sees Marxist theory as primarily science and not philosophy but he does not adhere to Engels's "natural philosophy". He claims that the philosophy implicit in Marxism is an epistemology (theory of knowledge) that sees science as "theoretical practice" and philosophy as the "theory of theoretical practice". However, he later qualifies this by claiming that Marxist philosophy, unlike Marxist science, has normative and ideological elements: Marxist philosophy is "politics in the field of theory" and "class struggle in theory".