13 Oct
2020
13 Oct
'20
7:50 p.m.
----- By 'complex number' A, I sometimes mean the quaternion A+0j, constructed from the pair of complex numbers (A,0). This subgroup of the quaternions is isomorphic to the standard complex numbers. Yes, I'm abusing the notation, but mathematicians often abuse notation. :-) ----- That's not abuse of notation. It's a mistake. —Dan