780 reputation
2528
bio website
location Seattle, WA
age 70
visits member for 2 years, 3 months
seen yesterday

I retired in 2006 and bought Mathematica and a stack of math books with the goal to teach myself to become a world-class mathematician. I am on pace to achieve that goal sometime shortly after the next Ice Age.

I consider myself a Mathematical Mutt (no papers) who occasionally ventures off the back porch to play in the yard with the big dogs.

I donate regularly to the The OEIS Foundation.

When I look at the patterns, I can hear the wheels turning. When I look at the math, I find out the hamsters have died.


Jul
31
asked Collatz Tool Box — any speed ups possible?
Jul
24
awarded  Fanatic
Jul
12
comment Building graph based on the cities connection?
@rm-rf, I assumed that since he is selecting cities by population, and if he wanted one point in each state, then the resultant graph would have the most populus city of each state as the location of its vertex. I had used this approach on the travelling salesman problem 30-years ago (without any more success than the other methods.)
Jul
12
comment Building graph based on the cities connection?
Imagine a light-house with its revolving light at each city. When the light hits another city, draw the line, unless that line crosses another. The bottom graph has no crossing lines. (i.e., it's planar.) That's the best I can do to help.
Jul
12
comment Building graph based on the cities connection?
Bottom graph is most populus city in each state. Then there is a pruning algorithm to reduce the number of edges.
Jun
25
revised How do we solve N-Rooks variation using primes?
added another link
Jun
25
revised How do we solve N-Rooks variation using primes?
Cleaned up per suggestion
Jun
22
comment Trace of FullSimplify
I put a ( before the 2b and a ) before the / on the second line, which made only one fraction.
Jun
22
comment Trace of FullSimplify
The reason I asked, is that I broke it down into smaller chunks to try the simplify and got a different answer. (I was treating the entire thing as a fraction, which is not how it is stated.)
Jun
22
comment Trace of FullSimplify
What did you get manually?
Jun
21
comment Can I run calculations on an external ssh server that doesn't have Mathematica installed?
It would depend on your license with Wolfram. My license allows two copies, work and home. And, while I only have one installed, I can launch two copies in the same computer, but no more than that.
Jun
20
revised Stop Computation - Is Exit[] overkill?
Removed the word "prime" from statement
Jun
20
answered Stop Computation - Is Exit[] overkill?
Jun
17
awarded  Benefactor
Jun
17
accepted Wallis Formula and Pippenger Product---How do we get symbolic output?
Jun
17
comment Wallis Formula and Pippenger Product---How do we get symbolic output?
The observation about the discontinuities is the answer.
Jun
13
comment Wallis Formula and Pippenger Product---How do we get symbolic output?
+1 for the great analysis. I'm reviving hamsters as I write this. The link to Pippenger in the OP has something similar for the $n$th steps.
Jun
12
revised Wallis Formula and Pippenger Product---How do we get symbolic output?
cleaned up bounty edit paragraph
Jun
12
revised Wallis Formula and Pippenger Product---How do we get symbolic output?
revised info
Jun
12
comment Wallis Formula and Pippenger Product---How do we get symbolic output?
@CoreyKelly, I put the results into the OP, so it is more easily read.