In the **previous post**, we have discussed compound propositions. We learned that compound proposition is a proposition formed from simple propositions using some logical connectors. The first logical connector that we are going learn is about “not” which is used for negation.

The negation of a proposition *p* denoted by ~*p* (read as “not p”) and is defined by the following truth table. As we can see, if *p* is true, then ~*p* is false. If *p* is false, then ~*p* is true.

Consider the following negations.

**Example 1**

q: I am going to the party.

~q: I am not going to the party.

**Example 2**

r: John is wealthy.

~r: John is not wealthy. Continue reading…