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Mathematics
Mark Fischler's user avatar
Mark Fischler's user avatar
Mark Fischler's user avatar
Mark Fischler
  • Member for 10 years, 2 months
  • Last seen this week
  • Aurora, IL
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About

I used to be a theoretical physicist, doing very early supergravity work as the first grad student of Peter vanNieuwenhuizen. I had a long career at the Fermi National Accelerator Laboratory, but have moved on to doing defense-related aeronautics work.

But mathematics has always been my strongest suit.

My Erdos number is 4.

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50
Prove that $\sum_{n=1}^\infty \frac{n!}{n^n}$is irrational.
Mar 11, 2015
41
Formula for the simple sequence 1, 2, 2, 3, 3, 4, 4, 5, 5, ...
Jan 31, 2016
33
Find some digits of $17!$
Feb 28, 2019
33
If a coin toss is observed to come up as heads many times, does that affect the probability of the next toss?
Jul 18, 2016
30
Why are irrational numbers such a big deal?
Jan 10, 2017
29
Are there continuous functions for which the epsilon-delta property doesn't hold?
Nov 7, 2016
28
Is there such a thing as a matrix of functions?
Jun 23, 2016
24
% of % - Please Help Me Prove My Friend Wrong
Nov 26, 2014
20
Is it mathematically wrong to prove the Intermediate Value Theorem informally?
Aug 4, 2015
18
$S=\sqrt{1}+\sqrt{2}+\sqrt{3}+\sqrt{4}+\dots+\sqrt{m}$ is almost an integer. Find $m$
Jul 9, 2019
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I feel mathematically inadequate for this site. What level are the majority of questions?
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When MathJax works on MathOverflow but not Math Stack Exchange
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Turn off all lights in a ring-shaped palace
18
Partial sums of primes
9
How ancient is the origin of the liturgical phrase "Baruch atah ... melech ha-olam"?
7
How can one demonstrate/assure safety for LRU's, CBAs, SoC's and other integrated modules?
6
What do the terms "offline" and "online" refer to in the field of high energy physics data analysis?