Ideas from 'The Concept of Logical Consequence' by John Etchemendy , 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
Validity is where either the situation or the interpretation blocks true premises and false conclusion
Etchemendy says fix the situation and vary the interpretation, or fix interpretations with varying situations