Show that if A and B are events with nonzero probabilities in a sample space S and either P A B = P A or P B A − P B , then events A and B are independent.
Show that if A and B are events with nonzero probabilities in a sample space S and either P A B = P A or P B A − P B , then events A and B are independent.
Solution Summary: The author proves that A and B are independent events with non-zero probabilities in a sample space.
Show that if
A
and
B
are events with nonzero probabilities in a sample space
S
and either
P
A
B
=
P
A
or
P
B
A
−
P
B
, then events
A
and
B
are independent.
Definition Definition For any random event or experiment, the set that is formed with all the possible outcomes is called a sample space. When any random event takes place that has multiple outcomes, the possible outcomes are grouped together in a set. The sample space can be anything, from a set of vectors to real numbers.
(a) Suppose a function f: C→C has an isolated singularity at wЄ C. State what it
means for this singularity to be a pole of order k.
(2 marks)
(b) Let f have a pole of order k at wЄ C. Prove that the residue of f at w is given
by
1
res (f, w):
=
Z
dk
(k-1)! >wdzk−1
lim
-
[(z — w)* f(z)] .
(5 marks)
(c) Using the previous part, find the singularity of the function
9(z) =
COS(πZ)
e² (z - 1)²'
classify it and calculate its residue.
(5 marks)
(d) Let g(x)=sin(211). Find the residue of g at z = 1.
(3 marks)
(e) Classify the singularity of
cot(z)
h(z) =
Z
at the origin.
(5 marks)
1. Let z = x+iy with x, y Є R. Let f(z) = u(x, y) + iv(x, y) where
u(x, y), v(x, y): R² → R.
(a) Suppose that f is complex differentiable. State the Cauchy-Riemann equations
satisfied by the functions u(x, y) and v(x,y).
(b) State what it means for the function
(2 mark)
u(x, y): R² → R
to be a harmonic function.
(3 marks)
(c) Show that the function u(x, y) = 3x²y - y³ +2 is harmonic.
(d) Find a harmonic conjugate of u(x, y).
(6 marks)
(9 marks)
Please could you provide a step by step solutions to this question and explain every step.
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