Do the 2 things respectively with the three syllogistic argu
Do the 2 things respectively with the three syllogistic arguments given below:
1. Translate the following arguments by using predicate letters (as defined below), constant variables, and quantifiers; and
2. Show that they are logically valid by deriving the conclusion from the premises.
{6} [17] P1: All humans have inviolable rights. P2: Not all creatures have inviolable rights. C: Therefore, there are many creatures that cannot be humans. H: being a human I : having inviolable rights C: being a creature
[18] P1: There is no human being who is not mortal. P2: No angels are mortal. C: Therefore, no human beings are angels. H: being a human M: being mortal A: being an angel
Solution
Declare the argument to be valid if every starred row has a T in its last column
2. 6.Translate
P1: H -> I
P2: ~C -> I
C: C -> ~H
Let\'s form the table.
Row 1 indicates it is possible that even when all the premises are true, the conclusion can be false.
Hence, it is INVALID.
18, Translate
P1: ~H -> ~M
P2: ~A -> M
C: ~H->A
Let\'s form the table.
Declare the argument to be valid if every starred row has a T in its last column.
Hence, it is VALID.
| H | I | C | ~C | ~H | H->I | ~C->I | C->~H |
| T | T | T | F | F | T | T | F |
| T | T | F | T | F | T | T | T |
| T | F | T | F | F | F | T | F |
| T | F | F | T | F | F | F | T |
| F | T | T | F | T | T | T | T |
| F | T | F | T | T | T | T | T |
| F | F | T | F | T | T | T | T |
| F | F | F | T | T | T | F | T |
