Prove that if f is a bounded function on a bounded interval
[a,b] and f is continuous except at finitely many points in [a,b],
then f is integrable on [a,b]. Hint: Use interval additivity, and
an induction argument on the number of discontinuities.
(a) Prove that Sn is generated by the elements in the set {(i
i+1) : 1≤i≤n}.
[Hint: Consider conjugates, for example (2 3) (1 2) (2
3)−1.]
(b) ProvethatSn isgeneratedbythetwoelements(12)and(123...n) for
n ≥ 3.
(c) Prove that H = 〈(1 3), (1 2 3 4)〉 is a proper subgroup of
S4.
Let sn = 21/n+ n sin(nπ/2), n ∈ N.
(a) List all subsequential limits of (sn).
(b) Give a formula for nk such that (snk) is an unbounded
increasing subsequence of (sn).
(c) Give a formula for nk such that (snk) is a convergent
subsequence of (sn).