more from this thinker
|
more from this text
Single Idea 13764
[filed under theme 10. Modality / B. Possibility / 8. Conditionals / c. Truth-function conditionals
]
Full Idea
Are conditionals truth-functional - do the truth values of A and B determine the truth value of 'If A, B'? Are they non-truth-functional, like 'because' or 'before'? Do the values of A and B, in some cases, leave open the value of 'If A,B'?
Gist of Idea
Are conditionals truth-functional - do the truth values of A and B determine the truth value of 'If A, B'?
Source
Dorothy Edgington (Conditionals [2001], 17.1)
Book Ref
'Blackwell Guide to Philosophical Logic', ed/tr. Goble,Lou [Blackwell 2001], p.386
A Reaction
I would say they are not truth-functional, because the 'if' asserts some further dependency relation that goes beyond the truth or falsity of A and B. Logical ifs, causal ifs, psychological ifs... The material conditional ⊃ is truth-functional.
Related Ideas
Idea 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]
Idea 14309
Truth-functional conditionals can't distinguish whether they are causal or accidental [Mumford]
The
25 ideas
with the same theme
[conditional truth based entirely on components]:
20789
|
Conditionals are false if the falsehood of the conclusion does not conflict with the antecedent
[Stoic school, by Diog. Laertius]
|
12197
|
Inferring q from p only needs p to be true, and 'not-p or q' to be true
[Russell]
|
14450
|
All forms of implication are expressible as truth-functions
[Russell]
|
14305
|
In the truth-functional account a burnt-up match was soluble because it never entered water
[Carnap]
|
8948
|
The odd truth table for material conditionals is explained by conversational conventions
[Grice, by Fisher]
|
13767
|
Conditionals might remain truth-functional, despite inappropriate conversational remarks
[Edgington on Grice]
|
13856
|
Conditionals are truth-functional, but we must take care with misleading ones
[Grice, by Edgington]
|
15725
|
Normal conditionals have a truth-value gap when the antecedent is false.
[Quine]
|
14288
|
'If A,B' affirms that A⊃B, and also that this wouldn't change if A were certain
[Jackson, by Edgington]
|
13769
|
Conditionals are truth-functional, but should only be asserted when they are confident
[Jackson, by Edgington]
|
14289
|
There are some assertable conditionals one would reject if one learned the antecedent
[Jackson, by Edgington]
|
14353
|
Modus ponens requires that A→B is F when A is T and B is F
[Jackson]
|
14354
|
When A and B have the same truth value, A→B is true, because A→A is a logical truth
[Jackson]
|
14355
|
(A&B)→A is a logical truth, even if antecedent false and consequent true, so it is T if A is F and B is T
[Jackson]
|
13858
|
The truth-functional account of conditionals is right, if the antecedent is really acceptable
[Jackson, by Edgington]
|
14361
|
Lewis says indicative conditionals are truth-functional
[Lewis, by Jackson]
|
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]
|
14274
|
Inferring conditionals from disjunctions or negated conjunctions gives support to truth-functionalism
[Edgington]
|
14276
|
The truth-functional view makes conditionals with unlikely antecedents likely to be true
[Edgington]
|
14275
|
Truth-function problems don't show up in mathematics
[Edgington]
|
14290
|
Doctor:'If patient still alive, change dressing'; Nurse:'Either dead patient, or change dressing'; kills patient!
[Edgington]
|
14309
|
Truth-functional conditionals can't distinguish whether they are causal or accidental
[Mumford]
|
22281
|
A material conditional cannot capture counterfactual reasoning
[Potter]
|
8947
|
If all truths are implied by a falsehood, then not-p might imply both q and not-q
[Fisher]
|