15 Nov
2013
15 Nov
'13
10:07 a.m.
It actually is possible for a rational function OF SEVERAL VARIABLES to be discontinuous. I.e. different limits as you approach a 0/0 point from different directions. Little known fact. You might want to read Feynman about his experiences re school textbooks; he was on a California board trying to decide on textbooks. He seemed to conclude it was beyond his power to correct the idiocy.