Surely everyone knows that the result of multiplying two negative numbers is positive. The formula "minus times a minus is a plus" or **"negative times a negative is a positive"** was put into our heads during the early school years. However, the teachers have forgotten to explain why this is the case, and to pass the motivation of mathematicians who defined the arithmetic of negative numbers.

## 🎯 User functions definition - the unique convenience provided by the Scalar Calculator

**Functions for mathematics are what elementary particles are for physics. **For this reason, the Scalar Calculator and its mathematical engine, provide the syntax for defining user functions, which is as close to natural as possible. Just enter f (x) = x^2 and you are ready to go. Stay tuned to learn a bit more details! 🙂

## ⭐ Basic user defined functions

The syntax for defining user functions is as follows.

**FunctionName(param1 <, param2, ...>) = expression**

## 🎯 User arguments definition - the true power of Scalar Calculator

**Defining user arguments and constants is what makes Scalar unique in the panorama of available calculators. **Take a moment to familiarize yourself with this short tutorial. It is definitely a dose of very useful knowledge. Stay tuned 🙂