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visits member for 3 years, 11 months
seen Jan 25 at 4:48

Just an adult math student, trying to learn a few interesting things while passing through this world.


Jan
15
comment Algorithm for finding “fact families”
@MarioCarneiro Ok, I understand what you mean.
Jan
15
comment Algorithm for finding “fact families”
@MarioCarneiro if a better algorithm cannot be found it might also be an interesting problem to see if a bound on the number of sets with exactly k digits under n could be determined
Jan
15
comment Algorithm for finding “fact families”
@MarioCarneiro Well, I'm assuming that it's not possible to store the sets. In terms of computationl efficiency, as the algorithm is brute force, I'm also assuming that while we don't know the specific O of this there is probably no worse algorithm for generating the sets other than say the random "bogo sort" approach
Jan
15
comment Algorithm for finding “fact families”
@Joffan She told me after she consulted with the child's teacher that families including "1" as a factor should be excluded; originally the program included them. I do not understand why. Nobody else seems to be able to agree either: blurtit.com/2259050/…
Jan
15
revised Algorithm for finding “fact families”
deleted 2 characters in body
Jan
15
asked Algorithm for finding “fact families”
Oct
18
awarded  Notable Question
Sep
24
awarded  Autobiographer
Sep
5
awarded  Popular Question
Aug
28
comment Very difficult sum of series
@lincolo Wolfram Alpha seems to be able to evaluate it in closed form, so..m.wolframalpha.com/input/…
Aug
28
comment What is the Laplace Transform for the next equation?
@MSci Arturo Ortiz If the original equation is correct as it stands now, I don't think the answer is correct. The Laplace transform of a derivative should involve initial conditions somewhere.
Aug
28
awarded  Organizer
Aug
28
revised What is the Laplace Transform for the next equation?
changed tag from Laplace equation to Laplace transform
Aug
28
suggested approved edit on What is the Laplace Transform for the next equation?
Aug
28
comment What is the Laplace Transform for the next equation?
How did you get your solution? Can you show us your work?
Jul
2
awarded  Curious
May
23
comment Infinite sum of Bessel Functions
Drat, I just started work on the same answer! +1
May
23
comment Infinite sum of Bessel Functions
The formula $J_0(x + y) = J_0(x)J_0(y) - 2J_1(x)J_1(y) + 2J_2(x)J_2(y) - ...$ may come in useful here.
May
20
comment How to solve inhomogeneous Laguerre equation?
@Dmoreno For this particular ODE, if I have done my math correctly, when taking the Laplace transform all terms involving initial conditions cancel.
May
20
answered How to solve inhomogeneous Laguerre equation?