Necessity and related notions (relevant) Flashcards
1
Q
Necessary truth
A
True, and could not have been false
2
Q
Contingent truth
A
True, but could have been otherwise
3
Q
A priori truth
A
Can be known a priori to be true
4
Q
A posteriori truth
A
Can be known to be true, but cannot be known a priori to be true
5
Q
Reflexive relations
A
If and only if everything bears that relation to itself, e.g. x is the same size as y, everything is the same size as itself
6
Q
Symmetric relations
A
If and only if, for any x and y, if x bears the relation R to y, then y bears the relation R to x
7
Q
Transitive relations
A
If and only if, for any x, y and z, if z bears the relation R to y, and y bears the relation R to z, then x bears the relation R to z
