I'm studying propositional logic the section on "valid arguments".
A self-assessment question reads
"Show whether or not the following argument is valid"
I don't know what function to apply to P to calculate C.
The solution in the back of the book shows the following truth table:
Variables Premise Conclusion P C P C F F F F F T F T T F T F <-- T T T T
So the conclusion is that the argument is invalid because the premise is true and the conclusion false.
I understand that of course, but how do I calculate Conclusion? Do I just guess what it should be?
My teacher had the following to say:
If P is True, C is True. If P is False, C is False.
Swap it for 'Premise - I am thirsty' & 'Conclusion - I drink some water'
The conclusion is dependant on the premises. If there is only one, they > will never differ and a Conclusion will never be False, with a True Premise.
This answer flies in the face of the answer in the book.
I pointed this out to my teacher and got the following:
My understanding is that P is the only variable; C is the conclusion that represents what P might be i.e True or False, once evaluated.
So... in conclusion I find myself still confused