Scepticism about the external world

The Dream Argument for Scepticism about the External World:

(1) Subjective experience is either a dream or reality.

(2) If subjective experience is a dream, then it is caused by the mind.

(3) If subjective experience is reality, then it is caused by the world.

(4) There is no difference between the experience of a dream and the experience of reality.

Hence, there is no way of knowing if there is a world, or if it is all in the mind.

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