Combining Philosophers

Ideas for Sigmund Freud, Pascal Engel and K Marx / F Engels

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2 ideas

1. Philosophy / D. Nature of Philosophy / 3. Philosophy Defined

5278	Philosophy is no more than abstractions concerning observations of human historical development [Marx/Engels]

1. Philosophy / F. Analytic Philosophy / 3. Analysis of Preconditions

4739	In "if and only if" (iff), "if" expresses the sufficient condition, and "only if" the necessary condition [Engel]