Kollagunta Gopalaiyer Ramanathan, Indian mathematician (Hyderabad 13 November 1920 – Bombay 10 May 1992) Gained international recognition for his researches on analytic theory of quadratic forms, modular functions and discontinuous groups Obtained a formula for the discriminant of a division algebra Solved the problem of constructing infinitely many classes of mutually incommensurable discrete groups of the first kind in classical semisimple groups Proved that complete spacelike submanifolds with parallel mean curvature vector in a De Sitter space are totally umbilical independent of K. Akutagawa & Q.M. Cheng LINKS http://matwbn.icm.edu.pl/ksiazki/aa/aa64/aa6411.pdf

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