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Message boards : General discussion : Your Erdos Number

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composite
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Message 101292 - Posted: 25 Nov 2016 | 3:57:10 UTC

I coauthored exactly one math paper, which by chance gave me an Erdos Number = 5. I am also credited with finding some primes with PrimeGrid, consequently "PrimeGrid, et al." are credited with finding some primes with me. So ALL you crunchers, with primes or without, have an Erdos Number no greater than 6. Or does that only apply to publication in peer-reviewed journals?

Iain Bethune
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Message 101296 - Posted: 25 Nov 2016 | 9:20:06 UTC - in response to Message 101292.

Or does that only apply to publication in peer-reviewed journals?

Afraid only published articles count :( And even more restrictively, the automated online tools for determining your Erdos Number e.g. http://www.ams.org/mathscinet/collaborationDistance.html only count papers indexed on MathSciNet.

- Iain
____________
Proud member of team "Aggie The Pew". Go Aggie!
3073428256125*2^1290000-1 is Prime!

mackerel
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Message 101299 - Posted: 25 Nov 2016 | 12:16:58 UTC

Has anyone defined a relaxed-rule equivalent? If not, let's do it here and call it the ________ Erdos number. Fill in the blank. Random suggestions: Expanded, extended, relaxed, informal...

Gary Craig
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Message 101339 - Posted: 27 Nov 2016 | 2:28:51 UTC

But what is your Erdos-Bacon-Sabbath number?

http://erdosbaconsabbath.com/
(mine is "infinity", BTW)

--Gary

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Message 101362 - Posted: 27 Nov 2016 | 17:56:28 UTC - in response to Message 101339.

But what is your Erdos-Bacon-Sabbath number?

http://erdosbaconsabbath.com/
(mine is "infinity", BTW)

--Gary

Mine is also infinity.
However, movie credits are pretty easy to get. One of the kids at home has a Bacon number of 3. They cut his scene with Carmen Electra but kept him in a background shot.

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Message 101364 - Posted: 27 Nov 2016 | 18:55:55 UTC - in response to Message 101362.

Is it a formal requirement to be an actor to have a Bacon number? I have a friend who would be at most 3, as she was a zombie in a film. Plugging in some of the rest of the cast there are two unambiguous cases each scoring 2, although I got bored after a handful and didn't test all the cast.

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Message 101365 - Posted: 27 Nov 2016 | 19:07:04 UTC - in response to Message 101364.
mackerel
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Message 101368 - Posted: 27 Nov 2016 | 19:30:20 UTC - in response to Message 101365.

That's the site I was using, but interestingly if I search her name, it comes up blank. She is listed on IMDB. I recalled one of her friends joined her, and if I try same for her, I get same. On further examination, the site excludes various categories. This wasn't a major film and was direct to DVD so may be excluded on those grounds.

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Message 101373 - Posted: 27 Nov 2016 | 20:05:01 UTC - in response to Message 101368.

And she doesn't show up when you turn on the direct-to-DVD flag in the search options?

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Message 101381 - Posted: 27 Nov 2016 | 23:10:18 UTC - in response to Message 101373.

Even with everything checked, it says not in database. They must have excluded that film for some reason. It also affects others of the main cast, not just extras.

Roger
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Message 101388 - Posted: 28 Nov 2016 | 4:29:16 UTC

My Erdos Number = 3
Albert Y Zomaya was my Engineering Honours supervisor.
He published my Honours work along with Stephan Olariu.
Paper was called: The Single Row Routing Problem Revisited: A Solution Based on Genetic Algorithms

Roger Karpin coauthored with Stephan Olariu MR1983260
Stephan Olariu coauthored with Dieter Kratsch MR1829834
Dieter Kratsch coauthored with Paul Erdős1 MR1133813

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Message 101391 - Posted: 28 Nov 2016 | 8:48:34 UTC - in response to Message 101388.

My 5-reference is 24 years older than your 3-reference.

A three-term recursion and the computation of Mathieu functions.

R. Lacroix coauthored with Felix M. Arscott MR0541916
Felix M. Arscott coauthored with František Neuman MR0283282
František Neuman coauthored with Árpád Elbert MR1167505
Árpád Elbert coauthored with András Sárközy MR0154023
András Sárközy coauthored with Paul Erdős1 MR0195837

And here's the weird story behind it.

Felix M. Arscott [wikipedia] was a professor of Applied Maths (and former RAF pilot during WWII). His lectures were never dull, not the least reason being that he had a funny way (to us students) of moving his eyebrows up and down as he spoke. One day in a first-year math course he taught for engineering students in fall 1977 he talked about his research on solution methods for ellipsoidal wave equations (which could represent sound waves coming out of jet engines), methods that were suitable for implementation on programmable calculators. My buddy and I, who were taking that course, thought it would be fun to try coding the method on our recently purchased calculators, but he had a TI 59 (with magnetic card storage) and I only had a lowly TI 58 that lost the program when I turned it off. So I went all-out with FORTRAN the following summer, coding it as my first serious program while I was still learning FORTRAN as my first "real" programming language. And after a while (getting past the usual off-by-one loop counter mistakes that novices make) Dr. Arscott started to get really excited about the results my program was producing, and he wanted to explore some parts of the solution space, which I obliged. The parts he wanted to see were harder to solve, causing the program to run out the 2-second CPU time limit for batch jobs fed into the IBM System 370/168 mainframe via the students' punch card queue, so he set me up with a timesharing account on his research budget. That turned out to be a very valuable thing to have when I switched to Computer Science one year later.

I don't know the specs for that IBM mainframe, but it was replaced by the more impressive Amdahl 470V6 which had a whole 12 MB of main memory and ran at the lightning speed of 12 MHz.

Anyways, after that summer in 1978 the electrical engineering office called me and my buddy, and handed us envelopes from Dr. Arscott containing prints of a math paper with our names on it, which allowed me to have a "publications" section on my resume that looks mighty impressive - and I never had trouble finding work since then, sometimes when I wasn't even looking.

But I was having much more fun in second year EE writing software than doing actual school assignments; doing things like creating a thermodynamics problem description language and solver, rather than just solving the thermodynamics assignment with pen and paper. Maybe I could have dropped out of school at that point and made piles of money in industry because such software didn't exist, but I wasn't thinking about making a living, I wanted to have fun with computers and the university was the only place I knew that had one. So it was absolutely a no-brainer for me to switch programs from EE to Comp. Sci for the next school year. I found myself surrounded mostly by students that entered the program seeking only to have a career that was in high demand, while I was there to have a blast.

During my first term in Comp. Sci. in fall 1979 my professor of Numerical Algebra (Hugh C. Williams - check him out on T5K) made sure all his students attended a talk by D. H. Lehmer (of LLR fame) at a conference hosted at our university. According to the MathSciNet reference the same conference also featured my paper, but I was oblivious to that until I found my Erdos number recently. At the time I thought Lehmer's talk was interesting but I didn't realize how important his work is to the field of prime numbers.

I remember Lehmer giving a photo slide show about how he used a machine made with holed discs and bicycle chains. When a light beam had a clear path through all the discs a photo sensor circuit beeped. On hearing the beep, he would shut off the motor which drove the whole contraption and manually turn back the wheels to find the number that had passed through. I don't remember exactly what he was doing with the machine because I didn't understand it then, but I think now he was looking for numbers that were simultaneously congruent to a bunch of residues modulo prime numbers. That would make sense, and I don't remember this detail, but he could probably detatch a disc and reattach it with a different starting rotation to use a different residue.

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Message 101393 - Posted: 28 Nov 2016 | 9:48:40 UTC

I also illustrated a paper for Ralph G. Stanton (Erdos Number = 2) on graph theory but that doesn't count. He asked me to do it (he said) because I had some drafting skills. But just as likely it was because I had the drafting tools to make nice-looking curves to connect the vertices.

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Message 101671 - Posted: 3 Dec 2016 | 20:58:46 UTC

Mine is 3.
Batalov -> Lander -> Kleitman -> Erdos

Message boards : General discussion : Your Erdos Number