Combining Philosophers
Ideas for Xenophon, Volker Halbach and Derek Parfit
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5. Theory of Logic / E. Structures of Logic / 7. Predicates in Logic
15651
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Instead of saying x has a property, we can say a formula is true of x - as long as we have 'true' [Halbach]
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5. Theory of Logic / E. Structures of Logic / 8. Theories in Logic
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A theory is some formulae and all of their consequences [Halbach]
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