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- In the following, let (or
) be a sequence of real numbers and L is a
real number.
Rewrite each statement symbolically using quantifiers.
- Definition: The sequence s is said to converge
to L provided that if then there is a number N such
that n>N implies that . In this case, s is
called a convergent sequence, L is its limit, and we
write .
- Definition: The sequence s is said to converge
if it converges to some number L.
- For each of the following sequences, prove whether or not it
converges.
- .
- .
- .
- .
- .
- .
- .
- .
- where [x] denotes the
greatest integer not exceeding x.
- , where [x] is as in
the previous problem.
- .
- if n is odd and if n is even.
- if n is odd and if n is odd.
- if n is odd and if n is even.
- Prove.
- If s is a convergent sequence, then s is bounded.
- If s is a convergent sequence, then its limit is unique.
- If s and t are sequences such that
and for every n, , then .
- If and for every n, is
in the interval [a,b], then L is also in [a,b].
- If s is a sequence and L is a number, then
if and only if
.
- If s is a bounded sequence and t is a null sequence (a
sequence converging to 0), then st is a null sequence.
- If t is a convergent sequence whose limit is not zero, and for
n in , , then 1/t is a bounded sequence.
- Suppose each of s and t is a convergent sequence and c is
a number; then s+t, s-t, and cs are convergent. Also, if
and ,
then and
.
- Suppose each of s and t is a convergent sequence, say
and ;
then st is convergent and . If,
in addition, is never 0 and , then s/t is
convergent and .
Next: About this document
Up: Elementary Analysis
Previous: Boundedness
Carl Lee
Wed Dec 2 12:11:38 EST 1998