i don't know what it mean "~"
Exercise: Describe the practical meaning of ~(p v q) using sentences.
The tilda means "not".
~(p ᴗ q) : not (p or q)
~(pᴗq)=(~p)ᴖ(~q)
In English: Neither condition is true. It is neither one nor the other. It is not one and it is also not the other.