Does Borel Cantelli lemma apply to infinite universes?

  • Thread starter Thread starter calios
  • Start date Start date
calios
Messages
9
Reaction score
0
guys I am bit confused with the statement borel cantelli lemma 2 :
"If the events En are independent and the sum of the probabilities of the En diverges to infinity, then the probability that infinitely many of them occur is 1"

this state if probability of A occur > 0 .
and if the probabilities of A diverges to infinity, then the probability that infinitely many of A occur is 1

the problem is
if probability of opposite A, event[not A] > 0
and if the probabilities of "not A" diverges to infinity
then the probability that infinetely many of [not A] occur is 1.
in other way the probability of A doest occur is 1 too? :confused:

this correct? :confused:
or i made a mistake ? thank you
 
Physics news on Phys.org
Borel-Cantelli says that the probability that infinitely many of the En occur is 1. It doesn't say that all the En must occur.

Likewise, it might be that infinitely many of the Enc occur. It's not said that they must all occur.

For example, the sequence 0,1,0,1,0,1,... becomes infinitely many times 0 and is infinitely times in the complement of 0.
 
micromass said:
Borel-Cantelli says that the probability that infinitely many of the En occur is 1. It doesn't say that all the En must occur.

Likewise, it might be that infinitely many of the Enc occur. It's not said that they must all occur.

For example, the sequence 0,1,0,1,0,1,... becomes infinitely many times 0 and is infinitely times in the complement of 0.

oke u mean..
ley say we have infinite many universe,
and probability Earth occur is 1/6, the probability Earth does not occur is 5/6
so the probability of infinite many Earth occur is 1. and the probability of infinite many Earth does not occur is 1 too.
in infinite universe both are happened right?
 
Last edited:
Namaste & G'day Postulate: A strongly-knit team wins on average over a less knit one Fundamentals: - Two teams face off with 4 players each - A polo team consists of players that each have assigned to them a measure of their ability (called a "Handicap" - 10 is highest, -2 lowest) I attempted to measure close-knitness of a team in terms of standard deviation (SD) of handicaps of the players. Failure: It turns out that, more often than, a team with a higher SD wins. In my language, that...
Hi all, I've been a roulette player for more than 10 years (although I took time off here and there) and it's only now that I'm trying to understand the physics of the game. Basically my strategy in roulette is to divide the wheel roughly into two halves (let's call them A and B). My theory is that in roulette there will invariably be variance. In other words, if A comes up 5 times in a row, B will be due to come up soon. However I have been proven wrong many times, and I have seen some...
Back
Top