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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?