Combining Texts

Ideas for 'Phaedo', 'fragments/reports' and 'Logical Consequence'

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6 ideas

5. Theory of Logic / A. Overview of Logic / 4. Pure Logic

10690

Formal logic is invariant under permutations, or devoid of content, or gives the norms for thought [Beall/Restall]

5. Theory of Logic / B. Logical Consequence / 2. Types of Consequence

10691

Logical consequence needs either proofs, or absence of counterexamples [Beall/Restall]

5. Theory of Logic / B. Logical Consequence / 4. Semantic Consequence |=

10695

Logical consequence is either necessary truth preservation, or preservation based on interpretation [Beall/Restall]

5. Theory of Logic / B. Logical Consequence / 8. Material Implication

10689

A step is a 'material consequence' if we need contents as well as form [Beall/Restall]

5. Theory of Logic / I. Semantics of Logic / 3. Logical Truth

10696

A 'logical truth' (or 'tautology', or 'theorem') follows from empty premises [Beall/Restall]

5. Theory of Logic / J. Model Theory in Logic / 1. Logical Models

10693

Models are mathematical structures which interpret the non-logical primitives [Beall/Restall]