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Ideas for 'Mahaprajnaparamitashastra', 'Frege philosophy of mathematics' and 'Mathematical logic and theory of types'

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2 ideas

5. Theory of Logic / A. Overview of Logic / 6. Classical Logic

9820	In classical logic, logical truths are valid formulas; in higher-order logics they are purely logical [Dummett]

5. Theory of Logic / L. Paradox / 5. Paradoxes in Set Theory / d. Russell's paradox

6407	The class of classes which lack self-membership leads to a contradiction [Russell, by Grayling]