Logic 2 Flashcards
1
Q
Opposition
A
the logical relation that exists between:
- two contradictories
- two contraries
- two proposition that differ in quality, quantity, or other
2
Q
Contradictories
A
two propositions so related that one is in denial or negation of the other.
-diagonals on square of opposition.
3
Q
Contraries
A
two propositions so related that they cannot both be true.
-top of square of opposition.
4
Q
Contingent
A
being neither tautologous nor self contradictory.
-may be true or false
5
Q
Subcontraries
A
two propositions so related that they cannot both be false.
-bottom of square of opposition.
