i2=-1 i3=-i i4=1 i5=i
z1±z2=x1±x2+iy1±y2
z1∙z2=x1∙x2-y1∙y2+i(x1∙y2+x2∙y1)
z1z2=(x1∙x2+y1∙y2)x22+y22+i(x2∙y1-x1∙y2)x22+y22
x+iy=±x+x2+y22+isgny-x+x2+y22
zk=nrcosφ+2kπn+isinφ+2kπn
matthas