The MathSciNet Author Database contains 429,481 entries. Now some of these are dead and not all may consider themselves mathematicians, but it also lists 11,304 active reviewers, they'll mostly be alive and qualify for the title of mathematician. Note that not every mathematician is an active reviewer so this 11,304 should be taken as a lower bound for the number of mathematicians (possibly a poor one).Poop-Loops said:By the way, I wasn't aware that there were even 10k mathmaticians in the world. :p
If you want to count math PhD's, according to the http://www.ams.org/employment/04-First-corrected.pdf [Broken] there were 1,041 granted in the US alone for 2003-2004, and it appears there have steadily been about a thousand per year for the past few years at least. I couldn't find the total number of math PhD's overall, but at the rate the US is producing them, I'd conjecture that there are far, far more than 10,000 alive at any time.
I guess that more people than you expect find mathematics not "mind-numbing" but rather stimulating enough to want to spend their lives doing it.
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