F7:  [Graphics:../Images/index_gr_61.gif]

"[Graphics:../Images/index_gr_62.gif]  for any nonzero  a  [in]  R.  In fact since  [Graphics:../Images/index_gr_63.gif],  by F5 we know that  [Graphics:../Images/index_gr_64.gif]  [is not equal to zero], so  [Graphics:../Images/index_gr_65.gif] exists, and F4 implies that  [Graphics:../Images/index_gr_66.gif] and  a  are equal, since both are solutions of the equation  [Graphics:../Images/index_gr_67.gif]."  (see ita-2-1-14-pg18)

ita


Converted [ in part ] by Mathematica      December 4, 2007