Can anyone confirm? thanks
Rewrite: and determine if its tautology, contradiction or neither. Using truth table I got contradiction.
My working out:
So I finished off with a contradiction. Is this correct? Any help would be much appreciated.
Right, but to be honest, I personally use a much more general rule: whenever there is a "false" anywhere in no matter how large a conjunction ( ), the whole conjunction collapses to the value "false".
It's akin to having a 0 in a product of numbers: the whole product collapses to the value 0.