Combining Texts
Ideas for
'fragments/reports', 'Modal Logics and Philosophy' and 'External and Internal Relations'
expand these ideas
|
start again
|
choose
another area for these texts
display all the ideas for this combination of texts
4 ideas
5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
8078
|
Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]
|
5. Theory of Logic / B. Logical Consequence / 7. Strict Implication
7789
|
Necessary implication is called 'strict implication'; if successful, it is called 'entailment' [Girle]
|
5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
6023
|
Every proposition is either true or false [Chrysippus, by Cicero]
|
5. Theory of Logic / H. Proof Systems / 5. Tableau Proof
7790
|
If an argument is invalid, a truth tree will indicate a counter-example [Girle]
|