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> There are many propositions that cannot be doubted, so that's insufficiently precise. I can even doubt that 1 + 1 = 2, because I cannot prove to myself that

> There are many propositions that cannot be doubted, so that's insufficiently precise. I can even doubt that 1 + 1 = 2, because I cannot prove to myself that I am not completely crazy. This is not a new idea at all, it's the "cogito ergo sum" of Descartes. > Your attempted definition would seem to assume that only conscious entities can "doubt", but is that really true? It is not necessary to assume that. It is enough to assume that a conscious entity cannot doubt its own consciousness in good faith.

naasking 8y ago
> I can even doubt that 1 + 1 = 2, because I cannot prove to myself that I am not completely crazy. Even if completely crazy, you still doubtless perceive and experience. > It is enough to assume that a conscious entity cannot doubt its own consciousness in good faith. If by "consciousness" you mean subjectivity, then I disagree. We cannot doubt that we have something that we conclude is subjectivity. The real question/the hard problem is determining whether such a conclusion is true.