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Math3321 Exam 1, Spring 2008 by Dr. Taixi Xu - Prof. Taixi Xu, Exams of Mathematics

The spring 2008 exam for math3321 - calculus iii at spsu, prepared by dr. Taixi xu. The exam covers topics such as uniform continuity, differentiability, and limits. Students are required to prove theorems, determine continuity, and find taylor polynomials.

Typology: Exams

Pre 2010

Uploaded on 08/03/2009

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Spring 2008, math3321 Exam 1 Dr. Taixi Xu Department of Math, SPSU
Math 3321 Exam 1
Name: Score: / 100
Show all your work for credits or partial credits.
1. (15 points) Prove that the function is uniformly continuous on the given set by directly
verifying the
property in the definition of uniformly continuity.
]5,2[,)(
2
xxf
2. (15 points) Determine which of the following continuous functions are uniformly
continuous on the given set. Justify your answer.
a)
)1,0(
1
sin)( on
x
xxf
b)
)1,0(
1
)(
2
on
x
xf
Page 1 of 4
pf3
pf4

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Math 3321 Exam 1

Name: Score: / 100

Show all your work for credits or partial credits.

  1. (15 points) Prove that the function is uniformly continuous on the given set by directly verifying the    property in the definition of uniformly continuity. f ( x ) x^2 , [ 2 , 5 ]
  2. (15 points) Determine which of the following continuous functions are uniformly continuous on the given set. Justify your answer. a) (^0 ,^1 ) 1 ( ) sin on x f xx b) (^0 ,^1 )

( ) 2 on x f x

  1. (15 points) Suppose that f^ :^ IR and g^ :^ IR are differentiable at cI. Prove that the function f^ ^ g is differentiable at c and (^)  fg  ( c ) f ( c ) g ( c ).
  2. (15 points) Let f^ be differentiable on (^ a ,^ b )and suppose that there exists m^ ^ R such that f^ (^ x ) m for all x^ ^ (^ a , b ). Prove that f^ is uniformly continuous on (^ a ,^ b ).

Choose one from the following two questions:

  1. ( Extra Credits: 10 points ) Let f^ be differentiable on an interval (^) I. Suppose that there exists M  0 and   0 such that f ( x ) f ( y ) xy^  for all x^ ,^ yI. (Such a function is said to satisfy a Lipschitz condition of order^ ^ on I. ) Prove that f^ is uniformly continuous on I.
  2. ( Extra Credits: 10 points ) Let f^ be differentiable on an open interval I

containing the point c^. Suppose that lim x  c^ f^ ( x )exists (and is finite), prove that f^ ^ is

continuous at c^.