Combining Philosophers

All the ideas for David Fair, Augustus De Morgan and John Etchemendy

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9 ideas

3. Truth / F. Semantic Truth / 1. Tarski's Truth / c. Meta-language for truth
19323 'Snow is white' depends on meaning; whether snow is white depends on snow [Etchemendy]
3. Truth / G. Axiomatic Truth / 1. Axiomatic Truth
19137 We can get a substantive account of Tarski's truth by adding primitive 'true' to the object language [Etchemendy]
5. Theory of Logic / B. Logical Consequence / 1. Logical Consequence
14181 Validity is where either the situation or the interpretation blocks true premises and false conclusion [Etchemendy, by Read]
14180 Etchemendy says fix the situation and vary the interpretation, or fix interpretations with varying situations [Etchemendy, by Read]
5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic
17744 De Morgan started the study of relations and their properties [De Morgan, by Walicki]
13501 De Morgan found inferences involving relations, which eluded Aristotle's syllogistic [De Morgan, by Hart,WD]
5. Theory of Logic / G. Quantification / 2. Domain of Quantification
17743 De Morgan introduced a 'universe of discourse', to replace Boole's universe of 'all things' [De Morgan, by Walicki]
26. Natural Theory / C. Causation / 4. Naturalised causation
8326 Science has shown that causal relations are just transfers of energy or momentum [Fair, by Sosa/Tooley]
10379 Fair shifted his view to talk of counterfactuals about energy flow [Fair, by Schaffer,J]