A foundational concept in mathematical analysis is the concept of limit. Limits are used to see what happens very close to things. Limits can also be used to see what happens when things get very big. For example, formula_1 is never zero, but as "n" gets bigger, formula_1 gets closer and closer to zero. The limit of formula_1 as "n" gets bigger is zero. This is described by "The limit of formula_1 as "n" goes to infinity is zero", and written as formula_5.