Combining Texts

All the ideas for 'Logical Consequence', 'Experimental Researches in Electricity' and 'A Dictionary of Philosophy'

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10 ideas

4. Formal Logic / A. Syllogistic Logic / 2. Syllogistic Logic

10688

'Equivocation' is when terms do not mean the same thing in premises and conclusion [Beall/Restall]

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]

6. Mathematics / B. Foundations for Mathematics / 2. Proof in Mathematics

10692

Hilbert proofs have simple rules and complex axioms, and natural deduction is the opposite [Beall/Restall]

12. Knowledge Sources / B. Perception / 4. Sense Data / a. Sense-data theory

6456	Sense-data are neutral uninterpreted experiences, separated from objects and judgements [Angeles]

27. Natural Reality / B. Modern Physics / 2. Electrodynamics / b. Fields

15314

Faraday's single field of variable forces introduces a criterion of Unity into what is ultimate [Faraday, by Harré/Madden]