00:01
For this problem, we'd like to determine whether or not this proposition is a contradiction.
00:09
So one way to do this is to look at the truth table.
00:12
Here i have a p and i also have a not p.
00:18
Let's go ahead and put those in there.
00:20
P could be either true or false.
00:24
And that implies that its negation is either false or true, right? if you take a not true, you get false and not false is true.
00:36
However, if we look at this statement like this, we need the truth of a and b to be the same.
00:46
So if a is true, we need b to be true, a is false, we need b to be false...