math: 134
stackoverflow: 55
superuser: 22
askubuntu: 18
physics: 16
electronics: 11
mathematica: 8
ell: 8
english: 6
serverfault: 6
travel: 6
diy: 5
scifi: 5
security: 5
mathoverflow.net: 5
unix: 5
dba: 5
chinese: 5
android: 4
apple: 4
academia: 4
russian: 4
wordpress: 4
gaming: 4
pets: 4
law: 4
meta: 4
graphicdesign: 4
ja.stackoverflow: 4
chemistry: 4
rpg: 4
salesforce: 3
judaism: 3
space: 3
cs: 3
emacs: 3
ham: 3
gis: 3
networkengineering: 3
dsp: 3
german: 2
tex: 2
gamedev: 2
rus: 2
islam: 2
bitcoin: 2