Let a ≈ 0.46163 be the positive real number that minimizes the factorial, x!. Then Euler's constant γ is given by
and
where ζ(s) is the Riemann zeta function. Both formulas follow trivially from the properties of the digamma function, but if I didn't know that, I'd find them pretty neat.
This blog is mostly about my work on free software projects, including mpmath, Sage, FLINT and SymPy. Since 2010, I'm a PhD student in the Algorithmic Combinatorics group at RISC, Austria.