The 'For All' Operator

See how it's all starting to make sense now?
The name makes it pretty obvious. This symbol is used to say "For All".
It's written as an upside-down A:

Let's see how it fits in.

Try to write this in logic: "For all y not equal to zero, there exists at least one x so that the product of x and y is positive"

Answer:Now, try to read this, from logic notation: Answer:
"For all x larger than the cubic root of x to the sixth, there exists at least one y between 0 and 1 so that the sum of x and y is less than 1."

Done already?
Up next: The Negation