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when toggle format what by license comment
Feb 19, 2014 at 19:24 history edited YCor CC BY-SA 3.0
fixed typo
Feb 19, 2014 at 16:28 comment added Simone Virili I think $C_2$ should be $A_2$, I'm not allowed to edit just one symbol. Nice answer!
Feb 18, 2014 at 16:42 history answered YCor CC BY-SA 3.0