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In page Unity of opposites:
"In his philosophy, Hegel ventured to describe quite a few cases of "unity of opposites", including the concepts of Finite and Infinite, Force and Matter, Identity and Difference, Positive and Negative, Form and Content, Chance and Necessity, Cause and effect, Freedom and Necessity, Subjectivity and Objectivity, Means and Ends, Subject and Object, and Abstract and Concrete. It is also considered to be integral to Marxist philosophy of nature and is discussed in Friedrich Engels' Dialectics of Nature.
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