Talk:Aufgaben:Problem 7
From Ferienserie MMP2
Did we prove the orthonormality of characters? meaning are you sure we can use them, it would make proof 13 much shorter...
Okay that doesn't make sense 13 (a) is the proof of that fact :). I see that in the ML from series 9, this was used so it's probably aright. Carl (talk) 14:30, 17 June 2015 (CEST)
