How do I construct the truth table for the following proposition: Yfrog Image : yfrog.com/59truthtablep

TY in advance.

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- July 20th 2010, 07:01 PMbrumby_3Truth Table
How do I construct the truth table for the following proposition: Yfrog Image : yfrog.com/59truthtablep

TY in advance.

- July 20th 2010, 07:03 PMAckbeet
The same way you construct any truth table: one piece at a time. You only have two variables, which means you'll only need 4 rows. How did you start out?

- July 20th 2010, 07:11 PMbrumby_3
Okay so the first two columns consist of all combinations of p and q, ie TT, TF, FT and FF. Then does the next column have the heading q^p?

- July 20th 2010, 07:12 PMAckbeet
Looks like a good first step. What values do you get?

- July 20th 2010, 07:17 PMbrumby_3
To be honest I'm not sure how to figure the values out. This is what's confusing me. Here's a guess: T, F, F, T or maybe they're all T?

- July 20th 2010, 07:20 PMAckbeet
Neither, I'm afraid. The AND works like this: p^q is true only if both p is true, and q is true. If either or both are false, then the AND function gives you a false. So, with that information, what do you get?

- July 20th 2010, 07:30 PMbrumby_3
So it is T, F, F, F?

- July 20th 2010, 11:44 PMintegral
take (p and q)

For (p,q)

(1,1)--> 1

(1,0)--> 0

(0,1)--> 0

(0,0)--> 0

Think about it now. - July 21st 2010, 02:55 AMAckbeet
That's correct. What step should you take now?

- July 21st 2010, 10:59 AMusagi_killer
This is how I'd do it.

Sorry I don't know how to do tables in LaTeX so I did it in paint, hope it's alright. I attached the file.

Note the last 2 rows, they are vacuously true since p is F.

Hope that helps... if you can any problems feel free to ask and I'll try explain.