Let A SACRA or A² is countable 3. Then A is a on R. o-algebra

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Let A SACRA or A² is countable 3. Then A is a o- algebra
on R.
Write down the correct answers to fill in the blank Spaces
labeled (a) to (1) in the Proof of the above statement below.
Proof:
Note that (a) and (b) are elements of A because
(C) is a countable Set and. _(d) is the complement.
of a countable set..
Next, Observe that if A € A, then either. le) or f is
Countable. Therefore If A is Countable, then. (9) € A, as
its Complement is a (h) set. If AC is Countable, then AC
€. Therefore AC Eat whenever A € A.
Finally, let A₁, A2, A3, Ed. If Aj is Countable for every
j= 1, 2, 3,---, then
(1) is Countable. Therefore it must.
be an element of A. Further, if Aj is countable for
Sonne Jo N, then (U₁₁ A;)² = (1) CAS is_(K)_.
Hence
(L) € A.
Transcribed Image Text:Let A SACRA or A² is countable 3. Then A is a o- algebra on R. Write down the correct answers to fill in the blank Spaces labeled (a) to (1) in the Proof of the above statement below. Proof: Note that (a) and (b) are elements of A because (C) is a countable Set and. _(d) is the complement. of a countable set.. Next, Observe that if A € A, then either. le) or f is Countable. Therefore If A is Countable, then. (9) € A, as its Complement is a (h) set. If AC is Countable, then AC €. Therefore AC Eat whenever A € A. Finally, let A₁, A2, A3, Ed. If Aj is Countable for every j= 1, 2, 3,---, then (1) is Countable. Therefore it must. be an element of A. Further, if Aj is countable for Sonne Jo N, then (U₁₁ A;)² = (1) CAS is_(K)_. Hence (L) € A.
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