Why did mathematicians conceptualized infinity? Do they use it in any mathematical systems?

Question

Why did mathematicians conceptualized infinity? Do they use it in any mathematical systems?

In: 13

Answer 1

18th century mathematician Leonhard Euler said “Infinity is just a way to reason about limits.” Limits are roughly a calculus-thing so until you start working with that it’s just a placeholder symbol. It’s an idea and not a number.