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 Feb 28 comment How to cast the “Numberdrum” problem mathematically @coffeemath: Sorry for the gaffe. No subset selection; all numbers in the outer ring must be used once. Feb 28 asked How to cast the “Numberdrum” problem mathematically Feb 28 revised How to prove there is no positive and continuous function satisfying some conditions edited for clarity. Feb 28 suggested approved edit on How to prove there is no positive and continuous function satisfying some conditions Feb 28 answered Name of a maximum bound Feb 28 comment Find the supremum for variance @JohnnyWesterling: Thanks, I stand corrected. Feb 28 revised Find the supremum for variance added 159 characters in body Feb 28 comment Find the supremum for variance @Learner: In this problem, the bound $ℙ(X<2)≤1/2$ turns uninteresting, but it could become if, say, the interval spans both positive and negative values. Feb 28 answered Find the supremum for variance Feb 27 comment I.i.d. Geometric Random Variables @Solver: Are you OK with my answer? Feb 26 revised I.i.d. Geometric Random Variables added part 2. Feb 25 comment Joint Probability mass function @DilipSarwate: Thanks for the example; corrected the post. Feb 25 revised Joint Probability mass function added 93 characters in body Feb 25 comment Joint Probability mass function @DilipSarwate: Is your example a valid joint distribution function? We need $\sum_x \sum_y P(x,y)=1$. Feb 25 comment Joint Probability mass function Edited... Just a name - pdf for cont. and pmf for discrete. Feb 25 revised Joint Probability mass function edited body Feb 25 answered Joint Probability mass function Feb 25 answered I.i.d. Geometric Random Variables Feb 25 revised What does positive definite matrix mean? added 76 characters in body Feb 25 answered What does positive definite matrix mean?