Combining Texts

All the ideas for 'Conditionals', 'The Concept of Logical Consequence' and 'Ignorance: a Case for Scepticism'

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9 ideas

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]

10. Modality / B. Possibility / 8. Conditionals / a. Conditionals

13768

Validity can preserve certainty in mathematics, but conditionals about contingents are another matter [Edgington]

10. Modality / B. Possibility / 8. Conditionals / b. Types of conditional

13770

There are many different conditional mental states, and different conditional speech acts [Edgington]

10. Modality / B. Possibility / 8. Conditionals / c. Truth-function conditionals

13764

Are conditionals truth-functional - do the truth values of A and B determine the truth value of 'If A, B'? [Edgington]

13765

'If A,B' must entail ¬(A & ¬B); otherwise we could have A true, B false, and If A,B true, invalidating modus ponens [Edgington]

13. Knowledge Criteria / C. External Justification / 6. Contextual Justification / b. Invariantism

8724	The meaning of 'know' does not change from courtroom to living room [Unger]

13. Knowledge Criteria / D. Scepticism / 1. Scepticism

8722	No one knows anything, and no one is ever justified or reasonable [Unger]

13. Knowledge Criteria / D. Scepticism / 4. Demon Scepticism

8723	An evil scientist may give you a momentary life, with totally false memories [Unger]