Combining Texts

Ideas for 'A Problem about Substitutional Quantification?st1=Saul A. Kripke', 'Proof of an External World' and 'Causes and Counterfactuals'

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11. Knowledge Aims / B. Certain Knowledge / 2. Common Sense Certainty
I can prove a hand exists, by holding one up, pointing to it, and saying 'here is one hand' [Moore,GE]