Power Function tends to One as Power tends to Zero/Rational Number

Theorem
Let $a \in \R_{> 0}$.

Let $f : \Q \to \R$ be the real-valued function defined as:
 * $f \left({ q }\right) = a^q$

where $a^q$ denotes $a$ to the power of $q$.

Then:
 * $\displaystyle \lim_{x \to 0} f \left({ x }\right) = 1$

Case 1: $a > 1$
If $a > 1$, then:
 * $\displaystyle \lim_{x \to 0} f \left({ x }\right) = 1$

from Power Function on Base greater than One tends to One as Power tends to Zero/Rational Number.

Case 2: $a = 1$
If $a = 1$, then:

Case 3: $0 < a < 1$
If $0 < a < 1$, then:
 * $\displaystyle \lim_{x \to 0} f \left({ x }\right) = 1$

from Power Function on Base between Zero and One Tends to One as Power Tends to Zero/Rational Number.

Hence the result.