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Top Questions
96 votes

How to solve $f(f(x)) = \cos(x)$?

ca.analysis-and-odes fractional-iteration asked Mar 9 '10 at 14:30
mathoverflow.net

53 votes

How to configure log4j to only keep log files for the last seven days?

java logging log4j asked Sep 10 '10 at 9:02
stackoverflow.com

51 votes

Why do we have an elementary charge but no elementary mass?

mass charge discrete asked Jan 30 '11 at 23:48
physics.stackexchange.com

51 votes

Was hay invented only in the Middle Ages in Europe?

middle-ages europe agriculture inventions asked Aug 28 '16 at 20:14
history.stackexchange.com

39 votes

Do gravitons interact with each other?

general-relativity quantum-gravity interactions asked Nov 20 '16 at 23:54
physics.stackexchange.com

34 votes

Do Maxwell's equation describe a single photon or an infinite number of photons?

photons quantum-electrodynamics maxwell-equations semiclassical asked Nov 20 '16 at 22:33
physics.stackexchange.com

32 votes

How can it be that the beginning universe had a high temperature and a low entropy at the same time?

thermodynamics cosmology temperature entropy big-bang asked Aug 26 '11 at 21:22
physics.stackexchange.com

30 votes

Would there be no time in a universe with only light?

spacetime mass speed-of-light time universe asked Oct 23 '16 at 11:32
physics.stackexchange.com

29 votes

What are curves (generalized ellipses) with more than two focal points called and how do they look like?

geometry reference-request terminology plane-curves asked Mar 25 '12 at 17:53
math.stackexchange.com

29 votes

Why is the contribution of a path in Feynmans path integral formalism $\sim e^{(i/\hbar)S[x(t)]}$

quantum-mechanics path-integral asked Apr 14 '11 at 20:16
physics.stackexchange.com

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How to solve $f(f(x)) = \cos(x)$?
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