iff:
Defining in terms of a given is enough to prove a limit.
Properties
Suppose .
One sided limits
In x-limit
Right limit
iff:
Left limit
iff:
In the answer
Top limit
iff:
Bottom limit
iff:
Limits including infinite
In x-limit
Positive infinity
iff:
Negative infinity
iff:
In the answer
Positive infinity
iff:
Negative infinity
iff: