Trigonometry

A radian is defined as follows. $360^{\circ} = 2 \pi$ radians. Dividing both sides by […]

Algebra

## Exponents

The following rules apply for exponents that are positive integers. The justification is sketched here. […]

Theory of Numbers

## Irrational Numbers

Are rational numbers the only numbers? The continuity of real numbers is an assumption in […]

Theory of Numbers

## Definition of a Sequence

The title of Section 2 in book [1] is Sequences of rational numbers. At the […]