Mister Exam

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1/z

Limit of the function 1/z

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The solution

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     1
 lim -
z->ooz
$$\lim_{z \to \infty} \frac{1}{z}$$
Limit(1/z, z, oo, dir='-')
Detail solution
Let's take the limit
$$\lim_{z \to \infty} \frac{1}{z}$$
Let's divide numerator and denominator by z:
$$\lim_{z \to \infty} \frac{1}{z}$$ =
$$\lim_{z \to \infty}\left(\frac{1}{z}\right)$$
Do Replacement
$$u = \frac{1}{z}$$
then
$$\lim_{z \to \infty}\left(\frac{1}{z}\right) = \lim_{u \to 0^+} u$$
=
$$0 = 0$$

The final answer:
$$\lim_{z \to \infty} \frac{1}{z} = 0$$
Lopital's rule
There is no sense to apply Lopital's rule to this function since there is no indeterminateness of 0/0 or oo/oo type
The graph
Rapid solution [src]
0
$$0$$
Other limits z→0, -oo, +oo, 1
$$\lim_{z \to \infty} \frac{1}{z} = 0$$
$$\lim_{z \to 0^-} \frac{1}{z} = -\infty$$
More at z→0 from the left
$$\lim_{z \to 0^+} \frac{1}{z} = \infty$$
More at z→0 from the right
$$\lim_{z \to 1^-} \frac{1}{z} = 1$$
More at z→1 from the left
$$\lim_{z \to 1^+} \frac{1}{z} = 1$$
More at z→1 from the right
$$\lim_{z \to -\infty} \frac{1}{z} = 0$$
More at z→-oo
The graph
Limit of the function 1/z