-Infinity doesn't exist.

1.There can be no number larger than infinity.
2.The sum of all numbers from -inf to inf is larger than infinity.
OR
2.The sum of all number from -inf to inf is infinity.
3.There cannot exist a -inf. It is inherent in saying "infinity"

Imagine a small planet where it has this weird rule :
Your size depends on how close you are to the core of the planet
Now, the inhabitants build up a rocket to explore the universe and find the end of it.
The rocket flies, but while it goes away from the planet it shrinks, with result the invabitants never actually leave, it appears infinite to them but to us it's not.
This is funny, it has been proved wrong but in the same time they use it as a rule at maths.