Ideas from 'The Concept of Logical Consequence' by John Etchemendy [1999], by Theme Structure

[found in 'The Concept of Logical Consequence' by Etchemendy,John [CSLI 1999,1-57586-194-1]].

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5. Theory of Logic / B. Logical Consequence / 1. Logical Consequence
Etchemendy says fix the situation and vary the interpretation, or fix interpretations with varying situations [Read]
Validity is where either the situation or the interpretation blocks true premises and false conclusion [Read]