Key points are not available for this paper at this time.
The main thrust of this paper is to study the biquadratic equation with four unknowns 1 ) ( 2 xyzw w z y x . We present six different infinite families of positive integral solutions to this equation. v u (50,37) 1 45 2 2 s r , (161,24)
M. A. Gopalan (Tue,) studied this question.