Recent content by lreyvega

  1. L

    Is X uncountable if there exists a B subset of uncountable with X-B uncountable?

    Hi everyone! I have the following problem Homework Statement X is countable set if and only if the sigma-field 2_{X} is generated by the sets of the form \left\{\omega\right\} with \omega\in X Homework Equations The Attempt at a Solution The easy part is X is countable...