Re: I cannot understand the sentence in a probability book.

On Jan 2, 9:34 am, water <waterloo2...@xxxxxxxxx> wrote:
When Ù is uncountable (e.g., Ù = R or [0, 1]),
it is not possible to define a reasonable measure for every subset of
Ù; for
example, it is not possible to find a measure on all subsets of R and
still
satisfy property m([a, b]) = b - a. This is why it is necessary to
introduce ó-fields that
are smaller than the power set.

what is the meaning of the sentence?
Thanks

Those sentences are perfectly clear to me. What exactly don't you
understand?

Dan Heyman
.