
Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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Let B be a ring on 2, µ : B → R, be additive.
Let A, BE B.
(a) Show that u(A) = µ(A\ B) + µ(An B).
(b) Show
µ(A) + µ(B) = µ(AUB) + µ(An B).
Hint: One way to do this is to use (a) and recall that (A\B)(B\A)
(AUB) \(An B).
(c)
Show that 4(AUB) = µ(A)+µ(B) H(ANB) provided that µ(ANB) E
R.
If N is a nonempty set and BC P(N) is nonempty, then u : B → Ro is
called a set function.
Definition. Let B be a ring on N and µ : B → R
• µ is called additive if µ(AUB) = µ(A) +µ(B) for all disjoint A, B e B.
• u is called o-additive if
uH An) = EH(An)
n=1
n=1
for any sequence (An) of pairwise disjoint sets in B with +, An E B.
• µ is called non-negative if µ(A) > 0 for all A e B.
• u is called increasing if µ(A) < µ(B) whenever A, B E B and A C B.
• u is called subadditive if µ(A U B) < µ(A) + µ(B) for all A, B E B.
• µ is called continuous from below if
u U An)
-lim μ (Α)
n00
n=1
for any increasing sequence (An) in B with UnEN An E B.
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