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 2d accepted Natural numbers in set theory is {0,1,2,…}? Jan25 awarded Yearling Dec29 comment Natural numbers in set theory is {0,1,2,…}? $\mathbb{N}$ is defined as the intersection of all inductive sets. Dec27 revised Natural numbers in set theory is {0,1,2,…}? added 383 characters in body Dec23 asked Natural numbers in set theory is {0,1,2,…}? Aug22 awarded Popular Question Aug19 awarded Popular Question Jul2 awarded Curious Dec3 accepted Sample space of the Monty Hall problem Dec2 asked Sample space of the Monty Hall problem Sep13 comment Finding the mean and Std Dev from Geometric probability Just use the formula for P(X = x) in the formula for mean and std. deviation and simplify. Sep13 comment a normed vector space is normed closed iff it is weakly closed. This question seems to have been posted before: math.stackexchange.com/questions/449301/… Aug23 awarded Yearling Jun30 accepted Finitely many non-convergent ultrafilters Jun30 comment Finitely many non-convergent ultrafilters Thanks. As you can tell, my intuition of ultrafilters sucks. I find your explanation using $\beta X$ intuitive, except that I don't see how the neighborhoods in $\beta X$ relate back to the elements inside the ultrafilters. Jun30 asked Finitely many non-convergent ultrafilters Jun5 accepted Non-convergent ultrafilter on $[0,\infty)$ Jun5 comment Non-convergent ultrafilter on $[0,\infty)$ Well that was easy. Why do I complicate my life all the time... Jun5 asked Non-convergent ultrafilter on $[0,\infty)$ Jun5 awarded Informed