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23h
answered What random variable is this?
Jan
31
reviewed Edit Is the following a distribution function
Jan
31
revised Is the following a distribution function
improved formatting
Jan
29
comment Simplify these “basis functions” for universal computation?
@user1667423 - I'm unaware of any new information relevant to this question. I've never created a bounty before, so allow me to make this my first.
Jan
18
comment How to find the polynomial given its factors? (A bit typical one here)
Nice explanation.
Jan
17
reviewed Approve Additive and Multiplicative Effects: Terminology
Jan
17
revised A rational orbit that's provably dense in the reals?
edited body
Jan
17
revised A rational orbit that's provably dense in the reals?
state function g explicitly
Jan
17
revised A rational orbit that's provably dense in the reals?
Can the Calkin-Wilf sequence be simply split into two sets such that each is dense in the positive reals?
Jan
17
revised A rational orbit that's provably dense in the reals?
add tag sequences-and-series
Jan
17
comment Is $x_{n+1}=\frac{x_n}{2}-\frac{2}{x_n}$ bounded?
Ah, yes ... this answer encounters the very same difficulty as the one attempted there. For my question, so far there is only the partial answer in the positive reals (as I noted).
Jan
17
comment Is $x_{n+1}=\frac{x_n}{2}-\frac{2}{x_n}$ bounded?
(+1) This also seems to answer my question about a rational orbit dense in the reals. (I would accept it there.)
Jan
10
comment How to calculate the expected value of the Powerball Lottery?
(+1) Although you say "Assume a population of $N$ possible tickets", you seem rather to treat $N$ as the number of tickets sold (each acting like a Bernoulli trial). The number of possible (distinct) tickets, on the other hand, is of course a constant -- viz., ${69\choose{5}}26 = 292,201,338$ for the current PowerBall game. (Note your typo in "$282.2$ million".) More than $10^9$ dollars was reported in ticket sales, so presumably $N$ would be somewhat less than half of that number (due to the "PowerPlay" option of paying $3$ (instead of $2$) dollars per ticket, for enhanced winnings).
Jan
7
revised A rational orbit that's provably dense in the reals?
clarify "rational mapping"; link to a partial answer
Jan
7
revised A rational orbit that's provably dense in the reals?
clarify "rational mapping"; link to a partial answer
Jan
7
revised A rational orbit that's provably dense in the reals?
edited tags
Jan
7
comment A rational orbit that's provably dense in the reals?
@D.Thomine - So for this answer to work, we need to find a rational $x_0$ such that the binary expansion of $\cot^{-1}x_0$ provably contains every finite binary string. Isn't that beyond current mathematics?
Jan
6
asked A rational orbit that's provably dense in the reals?
Dec
23
revised What's exactly the output of Fourier Transform?
add brief explanations
Dec
23
answered What's exactly the output of Fourier Transform?