Combining Texts
Ideas for
'Parmenides', 'Philosophical Logic' and 'On Second-Order Logic'
expand these ideas
|
start again
|
choose
another area for these texts
display all the ideas for this combination of texts
5 ideas
10. Modality / A. Necessity / 4. De re / De dicto modality
15420
|
De re modality seems to apply to objects a concept intended for sentences [Burgess]
|
10. Modality / A. Necessity / 6. Logical Necessity
15419
|
General consensus is S5 for logical modality of validity, and S4 for proof [Burgess]
|
15417
|
Logical necessity has two sides - validity and demonstrability - which coincide in classical logic [Burgess]
|
10. Modality / B. Possibility / 8. Conditionals / a. Conditionals
15422
|
Three conditionals theories: Materialism (material conditional), Idealism (true=assertable), Nihilism (no truth) [Burgess]
|
15423
|
It is doubtful whether the negation of a conditional has any clear meaning [Burgess]
|