From rusin Sun Oct 30 22:48:42 1994
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From: rusin (Dave Rusin)
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Subject: Re: Musical-mathematical families?
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Perhaps this has been mentioned (I just got here) but Felix Mendelssohn's
brother-in-law was a noted analytic number theorist (I'm pretty sure
it was Lejeune Dirichlet -- the one who proved for example that there
are infinitely many primes which are one more than a multiple of 4)
dave rusin@math.niu.edu

From es19@crux1.cit.cornell.edu Tue Nov  1 16:19:38 1994
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Hrm. His sister's grandson (I think) was the mathematician Hensel, who
invented p-adics.  Meanwhile, their grandfather (the grandfather of 
Felix and Fanny that is) was the philosopher Moses Mendelssohn...

-Eric Schissel