- #1
Tomath
- 8
- 0
Homework Statement
Show that lim (x,y) → (a,0) e^(x ln y) = 0 [itex]\forall[/itex]a > 0
Homework Equations
The Attempt at a Solution
I've tried looking at lim (x,y) → (a,0) x ln y seperately.
lim(x,y) → (a,0) x ln y = lim(x,y) -> (a,0) x * lim(x,y) → (a,0) ln y
= a * lim(x,y) → (a,0) ln y
Now lim(x,y) → (a,0) ln y is -∞. So we get lim(x,y) →(a,0) x ln y = -∞. Now lim z → -∞ e^z = 0.
The problem here is that we haven't discussed limits involving infinity in class and I'm pretty sure I'm not allowed to use it. My question therefore is: is there any other way to show that lim (x,y) → (a,0) e^(x ln y) = 0?