The four main metaphysical positions - Materialism, Dualism, Double-Aspect Theory, and Idealism.
Nikolaj Pilgaard Petersen, PhD.

0:00 Introduction
1:07 Materialism
5:30 (Substance-)Dualism
8:04 Double aspect theory
11:33 Idealism
17:50 Summary
18:52 Existential relevance
19:58 An open question

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