Similarly, the reals and the complex numbers each exclude infinity, so arithmetic isn't defined for it. You can extend those sets to include infinity - but then you have to extend the definition of the arithmetic Ò€¦ Infinity refers to something without any limit, and is a concept relevant in a number of fields, predominantly mathematics and physics.

A friend of mine was trying to explain to me how all infinities are equal. For example, they were saying that there are the same amount of numbers between $0$Ò€$1$ as there are between $0$Ò€$2$.