Bona MathematicaA pedagogical Journal in Mathematics, for college and university students and teachers. Subscription Information Editorial Board S. A. Katre Dept. of Mathematics, University of Pune, (Chief Editor) Pune, 411 007. A. M. Vaidya Dept. of Mathematics,Gujarath University, Ahmedabad, 380 009. Balawant Singh Dept. of Mathematics, IIT Bombay, Powai, Mumbai, 400076. S. Kumaresan Dept. of Mathematics, Bombay University, Vidyanagari, Mumbai, 400 098. N. Nitsure School of Mathematics, Tata Institute of Fundamental, Research(TIFR), Mumbai, 400 005. S. D. Adhikari Harish-chandra Research Institute (HRI), Allahabad, 211 019. M. R. Modak Head, Dept. of Mathematics,S. P. College, Pune, 411 030. M. Prakash Bhaskaracharya Pratishthana, 56/14, Erandavane, Pune, 411 004.