couples complexity theorem states that omega is complex. How? [closed]
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couples complexity theorem states that omega is complex. How?
probability-theory
closed as off-topic by John Ma, Jendrik Stelzner, Brahadeesh, Pierre-Guy Plamondon, amWhy Aug 25 at 11:32
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- "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." â John Ma, Jendrik Stelzner, Brahadeesh, Pierre-Guy Plamondon, amWhy
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couples complexity theorem states that omega is complex. How?
probability-theory
closed as off-topic by John Ma, Jendrik Stelzner, Brahadeesh, Pierre-Guy Plamondon, amWhy Aug 25 at 11:32
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." â John Ma, Jendrik Stelzner, Brahadeesh, Pierre-Guy Plamondon, amWhy
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up vote
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couples complexity theorem states that omega is complex. How?
probability-theory
couples complexity theorem states that omega is complex. How?
probability-theory
edited 2 days ago
asked Aug 25 at 2:46
mathnewbie
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274
closed as off-topic by John Ma, Jendrik Stelzner, Brahadeesh, Pierre-Guy Plamondon, amWhy Aug 25 at 11:32
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." â John Ma, Jendrik Stelzner, Brahadeesh, Pierre-Guy Plamondon, amWhy
closed as off-topic by John Ma, Jendrik Stelzner, Brahadeesh, Pierre-Guy Plamondon, amWhy Aug 25 at 11:32
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." â John Ma, Jendrik Stelzner, Brahadeesh, Pierre-Guy Plamondon, amWhy
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1 Answer
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There is no such probability measure.
More generally, let $S$ be an uncountable sample space, and suppose $P$ is a probability measure such that all singleton subsets of $S$ have positive probability.
For each integer $k > 1$, let
$S_k=sin Smid P(s) > largefrac1k$.
Then $S=displaystylebigcup_k=2^infty S_k$, hence $S_j$ is uncountable, for some $j$.
In particular, $S_j$ has at least $j$ elements.
But then, letting $A$ be a subset of $S_j$ with $j$ elements, we get
$P(A) > (j)bigl(largefrac1jbigr) = 1$, contradiction.
Thus, if $S$ is an uncountable sample space, there is no probability measure $P$ such that all singleton subsets of $S$ have positive probability.
I have edited the question.
â mathnewbie
Aug 25 at 9:56
You totally changed the question. Your previous title and question specified that the sample space was uncountable. My answer relates to that version.
â quasi
Aug 25 at 12:44
I apologise for the change.
â mathnewbie
Aug 25 at 12:46
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
There is no such probability measure.
More generally, let $S$ be an uncountable sample space, and suppose $P$ is a probability measure such that all singleton subsets of $S$ have positive probability.
For each integer $k > 1$, let
$S_k=sin Smid P(s) > largefrac1k$.
Then $S=displaystylebigcup_k=2^infty S_k$, hence $S_j$ is uncountable, for some $j$.
In particular, $S_j$ has at least $j$ elements.
But then, letting $A$ be a subset of $S_j$ with $j$ elements, we get
$P(A) > (j)bigl(largefrac1jbigr) = 1$, contradiction.
Thus, if $S$ is an uncountable sample space, there is no probability measure $P$ such that all singleton subsets of $S$ have positive probability.
I have edited the question.
â mathnewbie
Aug 25 at 9:56
You totally changed the question. Your previous title and question specified that the sample space was uncountable. My answer relates to that version.
â quasi
Aug 25 at 12:44
I apologise for the change.
â mathnewbie
Aug 25 at 12:46
add a comment |Â
up vote
0
down vote
There is no such probability measure.
More generally, let $S$ be an uncountable sample space, and suppose $P$ is a probability measure such that all singleton subsets of $S$ have positive probability.
For each integer $k > 1$, let
$S_k=sin Smid P(s) > largefrac1k$.
Then $S=displaystylebigcup_k=2^infty S_k$, hence $S_j$ is uncountable, for some $j$.
In particular, $S_j$ has at least $j$ elements.
But then, letting $A$ be a subset of $S_j$ with $j$ elements, we get
$P(A) > (j)bigl(largefrac1jbigr) = 1$, contradiction.
Thus, if $S$ is an uncountable sample space, there is no probability measure $P$ such that all singleton subsets of $S$ have positive probability.
I have edited the question.
â mathnewbie
Aug 25 at 9:56
You totally changed the question. Your previous title and question specified that the sample space was uncountable. My answer relates to that version.
â quasi
Aug 25 at 12:44
I apologise for the change.
â mathnewbie
Aug 25 at 12:46
add a comment |Â
up vote
0
down vote
up vote
0
down vote
There is no such probability measure.
More generally, let $S$ be an uncountable sample space, and suppose $P$ is a probability measure such that all singleton subsets of $S$ have positive probability.
For each integer $k > 1$, let
$S_k=sin Smid P(s) > largefrac1k$.
Then $S=displaystylebigcup_k=2^infty S_k$, hence $S_j$ is uncountable, for some $j$.
In particular, $S_j$ has at least $j$ elements.
But then, letting $A$ be a subset of $S_j$ with $j$ elements, we get
$P(A) > (j)bigl(largefrac1jbigr) = 1$, contradiction.
Thus, if $S$ is an uncountable sample space, there is no probability measure $P$ such that all singleton subsets of $S$ have positive probability.
There is no such probability measure.
More generally, let $S$ be an uncountable sample space, and suppose $P$ is a probability measure such that all singleton subsets of $S$ have positive probability.
For each integer $k > 1$, let
$S_k=sin Smid P(s) > largefrac1k$.
Then $S=displaystylebigcup_k=2^infty S_k$, hence $S_j$ is uncountable, for some $j$.
In particular, $S_j$ has at least $j$ elements.
But then, letting $A$ be a subset of $S_j$ with $j$ elements, we get
$P(A) > (j)bigl(largefrac1jbigr) = 1$, contradiction.
Thus, if $S$ is an uncountable sample space, there is no probability measure $P$ such that all singleton subsets of $S$ have positive probability.
answered Aug 25 at 4:49
quasi
33.9k22461
33.9k22461
I have edited the question.
â mathnewbie
Aug 25 at 9:56
You totally changed the question. Your previous title and question specified that the sample space was uncountable. My answer relates to that version.
â quasi
Aug 25 at 12:44
I apologise for the change.
â mathnewbie
Aug 25 at 12:46
add a comment |Â
I have edited the question.
â mathnewbie
Aug 25 at 9:56
You totally changed the question. Your previous title and question specified that the sample space was uncountable. My answer relates to that version.
â quasi
Aug 25 at 12:44
I apologise for the change.
â mathnewbie
Aug 25 at 12:46
I have edited the question.
â mathnewbie
Aug 25 at 9:56
I have edited the question.
â mathnewbie
Aug 25 at 9:56
You totally changed the question. Your previous title and question specified that the sample space was uncountable. My answer relates to that version.
â quasi
Aug 25 at 12:44
You totally changed the question. Your previous title and question specified that the sample space was uncountable. My answer relates to that version.
â quasi
Aug 25 at 12:44
I apologise for the change.
â mathnewbie
Aug 25 at 12:46
I apologise for the change.
â mathnewbie
Aug 25 at 12:46
add a comment |Â