Combining Philosophers

Ideas for Rescher,N/Oppenheim,P, Ludwig Wittgenstein and Mark Jago

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4 ideas

5. Theory of Logic / D. Assumptions for Logic / 3. Contradiction

23496

Two colours in the same place is ruled out by the logical structure of colour [Wittgenstein]

18736

Contradiction is between two rules, not between rule and reality [Wittgenstein]

5. Theory of Logic / D. Assumptions for Logic / 4. Identity in Logic

18154

The sign of identity is not allowed in 'Tractatus' [Wittgenstein, by Bostock]

13429

The identity sign is not essential in logical notation, if every sign has a different meaning [Wittgenstein, by Ramsey]