## Thinking Mathematically (6th Edition)

The humour in the above diagram is that cartoon is based on the fact that rational and the real number has different meanings in mathematics and in everyday life. Rational numbers are those numbers which are of the form $\frac{p}{q}$ where p, q are integers and$q\ne 0$. Real numbers include all the rational numbers such as integers and fractions and all the irrational numbers. The provided humour in the provided diagram is that $i$is an imaginary number, if the $i$ has been a rational number then it would have been a real number. Thus, the humour in the provided cartoon make sense.