Proceedings of the Indian Academy of Sciences Mathematical Sciences Volume 103, 1993 CONTENTS Transformation formula for exponential sums involving Fourier coefficients of modular forms C S Yogananda Determinants of parabolic bundles on Riemann surfaces I Biswas and N Raghavendra Convolution properties of some classes of meromorphic univaient functions S Ponnusamy Simultaneous operational calculus involving a product of a general class of polynomiais, Fox’s H-function and the multivariable H-function V B L Chaurasia and Girdhari Lal Some applications of Briot-Bouquet differential subordination Subhas S$ Bhoosnurmath and S R Swamy Construction techniques for Galois coverings of the affine line Shreeram S Abhyankar, Herbert Popp and Wolfgang K Seiler A footnote to mean square value of Dirichlet L-series Matrix summability of a factored Fourier series Subas Chandra Jena, Rashmi Mishra and Sakuntala Swain Absolute matrix summability of a factored Fourier series Subas Chandra Jena and Rashmi Mishra Multipliers for |N, p,;5|, summability of infinite series Hiiseyin Bor Bishop decompositions for vector function spaces H S Mehta, R D Mehta and M H Vasavada On M,-graded hypergroups A K Vijayarajan On Fatou’s lemma and parametric integrals for set-valued functions Nikolaos S Papageorgiou ii Volume contents Banerjee et al’s characterization theorem in thermohaline-convection and its magnetorotatory extensions Jyoti Prakash, Ajaib Singh and Savita Sharma Gysin maps and cycle classes for Hodge cohomology V Srinivas Some remarks on subgroups determined by certain ideals in integral group L R Vermani, Atul Razdan and Ram Karan On certain Ramanujan’s mock theta functions Anju Gupta Lambert series and Ramanujan R P Agarwal Behaviour of an associated conjugate series of a Fourier series Subas Chandra Jena and Mohammad Abid On regularity of twisted spherical means and special hermite expansions... S Thangavelu Weakly wandering sets and compressibility in descriptive setting S Eigen, A Hajian and M G Nadkarni On infinitesimal o-fields generated by random processes ..................... rn Vivek S Borka Absolutely continuous spectrum for sparse potentials............. M Krishna Oscillation of odd order delay differential equations Pitambar Das I ie ia 2 ids dn cnpuctebinaaenncsbiveaeSercdnancheedbvlvae treveirheessre s Author Index