ο αξιωματικός ορισμός του C στα μεταμαθηματικα

[bilstef]

http://us.metamath.org/mpegif/mmcomplex.html#axioms


...my daughters have been studying (chemistry) for several semesters, think they have learned differential and integral calculus in school, and yet even today don't know why x · y = y · x is true.
—Edmund Landau