show (b1+b2+...+bn)/n >= (b1b2...bn)^(1/n)
Hint: do induction over k when n = 2k . Then for...
show (b1+b2+...+bn)/n >= (b1b2...bn)^(1/n)
Hint: do induction over k when n = 2k . Then for 2k−1 < n
< 2k append to b1, b2, . . . , bn, 2 k − n equal numbers all
equal to the arithmetic mean of the first n.
How do you Interpret the meaning of the different coefficients
(b0, b1, b2, b3,b4,…bn) in a multiple regression? (slightly
different from the interpretation in simple regression)
1.Prove that{2k+1:k∈N}∩{2k2 :k∈N}=∅.
2.Give two examples of ordered sets where the meaning of ” ≤ ”
is not the same as the one used with the set of real numbers R.
Show that a graph with at least 2k vertices is k-connected if and
only if for any two unrelated subsets X, Y of V, such that | X | =
k = | Y |, there are k foreign paths between X and Y.
(a) Let n = 2k be an even integer. Show that x = rk
is an element of order 2 which commutes with every element of
Dn.
(b) Let n = 2k be an even integer. Show that x = rk
is the unique non-identity element which commutes with every
element of Dn.
(c) If n is an odd integer, show that the identity is the only
element of Dn which commutes with every element of
Dn.
Show that, in n-dimensional space, any n + 1 vectors are
linearly dependent.
HINT: Given n+1 vectors, where each vector has n components,
write out the equations that determine whether these vectors are
linearly dependent or not. Show that these equations constitute a
system of n linear homogeneous equations with n + 1 unknowns. What
do you know about the possible solutions to such a system of
equations?
Consider the series X∞ k=2 2k/ (k − 1)! . (a) Determine whether
or not the series converges or diverges. Show all your work! (b)
Essay part. Which tests can be applied to determine the convergence
or divergence of the above series. For each test explain in your
own words why and how it can be applied, or why it cannot be
applied. (i) Divergence Test (ii) Direct Comparison test to X∞ k=2
2k /(k − 1). (iii) Ratio Test