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How can you know that you exist? That you're not
a) a product of someone elses thought? b) a computersimulation in a world totally different than ours?
c) something else that we haven't yet discovered?
Cogito ergo sum.
If I'm a part of a simulation I exist as part of this simulation.
Same to the thought and the undiscovered thing.
Prop 1: I know that I exist.
Prop 2: I know that I do not know anything other than Props 1 and 2.
Prop 3: I know that I know that I do not know anything other than Proposition 1 and Proposition 2.
Prop 3 follows from and contradicts Prop 2.