Name: \hbox to 3.0 truein{\hrulefill } \hfill Page
\folio/\numpages I. Definitions
1.
(10 points) Define
(ϵ-δ): limx → af(x) = L.
2.
(10 points) Is the following a correct definition of limit?
Explain your answer.
Definition (Maybe).
lim
x → a
f(x) = L
means: For every δ > 0, there is an ϵ > 0 such that, for all x, if 0 < |x −a| < δ. then |f(x) − L| < ϵ.
II. Examples
3.
(10 points) Give an example of two functions f and g
such that f °g and g °f have different nonempty
domains. Be sure to specify domain(f), domain(g),
domain(f °g), and domain(g °f).
4.
(10 points) Give an example of a function f(x) defined
for all real numbers such that limx → 0f(x)
does not exist.
5.
(20 points) Let
F(x)
=
√
x2 − 1
,
G(x)
=
1
x
.
Describe:
•
domain(F) and domain(G).
•
domain(F + G)
•
domain(G °F)
•
domain(F °G)
•
domain([F/G])
•
domain([G/F])
III. Proofs
6.
(15 points) Prove: If g is continuous at a, g(a) ≠ 0, then
there is a δ > 0 for which (a − δ,a + δ) is contained
in the domain of [1/g].
7.
(15 points) Show, using only P1 - P12: For all numbers a,b,
− (a ·b)
= (−a)·b.
You may abbreviate (distributive, trichotomy, … ).
8.
(15 points) Show by mathematical induction or otherwise:
For all natural numbers n = 1, 2, …,
12 + 22 + …+ n2 =
n (n + 1) (2 n + 1)
6
.
IV. Qualitative Properties of Functions
9.
(25 points) The graph below shows how the height of a liquid
in an Erlenmeyer Flask Z varies as water is steadily dripped into it.
Copy the graph, and on the same diagram
show the height-volume relationship for Flask Z.
Describe the features of the graph you have drawn. Your
description should include
•
The domain of the function
•
The range of the function
•
The intervals of monotonicity (Increasing,
Decreasing)
•
The intervals of constant concavity and/or
linearity
•
Other observations …
A person reading your description of the graph should be able to
reproduce the graph of the function (and if she's good, guess
that it came from something shaped like an Erlenmeyer Flask).
V. Essay
10.
(Letter Grade: A - E) In the exam booklet, write an essay
on a topic of your choice that is very relevant to the material
considered in the course. Your essay should include at least
one substantial example and at least one substantial theorem and
its proof.
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