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9463
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Classical logic is bivalent, has excluded middle, and only quantifies over existent objects [Jacquette]
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Full Idea:
Classical logic (of Whitehead, Russell, Gödel, Church) is a two-valued system of propositional and predicate logic, in which all propositions are exclusively true or false, and quantification and predication are over existent objects only.
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From:
Dale Jacquette (Intro to I: Classical Logic [2002], p.9)
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A reaction:
All of these get challenged at some point, though the existence requirement is the one I find dubious.
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3643
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The concept of mind excludes body, and vice versa [Descartes]
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Full Idea:
The concept of body includes nothing at all which belongs to the mind, and the concept of mind includes nothing at all which belongs to the body.
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From:
René Descartes (Reply to Fourth Objections [1641], 225)
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A reaction:
A headache? Hunger? The mistake, I think, is to regard the mind as entirely conscious, thus creating a sharp boundary between two aspects of our lives. As shown by blindsight, I take many of my central mental operations to be pre- or non-conscious.
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