8. Logic Lecture: Symbolic Logic 

There is the case of a vacuously true statement. For example let's use the set { 1,2,3,4,5} Let A be the statement this set contains all the numbers that are both even and odd. Since there aren't numbers that are both even and odd then both A and ~A are true.

A-->B is tautologically equivalent to (~A or B). That's why the tree branches like that.

I am really sorry but can u plz answer how to translate "since"to a symbol? Wud it just be an arrow? "Since the safe was opened, it must have been blah

When Mike Jagger sings, "I ain't got no satisfaction," that means he doesn't have any satisfaction, right?

I was so very shit at these.