Combining Texts

Ideas for 'Material Beings', 'Posterior Analytics' and 'Belief Truth and Knowledge'

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7 ideas

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

12376

Demonstrations by reductio assume excluded middle [Aristotle]

5. Theory of Logic / B. Logical Consequence / 1. Logical Consequence

12373

Something holds universally when it is proved of an arbitrary and primitive case [Aristotle]

5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle

12363

Everything is either asserted or denied truly [Aristotle]

17587

The 'Law' of Excluded Middle needs all propositions to be definitely true or definitely false [Inwagen]

5. Theory of Logic / E. Structures of Logic / 4. Variables in Logic

17558

Variables are just like pronouns; syntactic explanations get muddled over dummy letters [Inwagen]

5. Theory of Logic / K. Features of Logics / 1. Axiomatisation

13004

Aristotle's axioms (unlike Euclid's) are assumptions awaiting proof [Aristotle, by Leibniz]

5. Theory of Logic / L. Paradox / 6. Paradoxes in Language / b. The Heap paradox ('Sorites')

17583

There are no heaps [Inwagen]