The Present volume was originally intended to be a Felicitation Volume for the 80th birthday of Prof. Niharranjan Ray. But his unfortunate demise on August 30, 1981 compelled us to change it into a Commemoration Volume. In the course of his long academic career extending over three decades Prof. Niharranjan Ray has worked either alone or with his students upon a wide variety of subjects. Therefore, to expand the scope of the Volume an attractive variety of ...
