C. N. S. Iyengar was an India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

n professor of mathematics and the founder head of the department of mathematics, Karnatak University

Karnatak University

The Karnatak University established initially at Mumbai in 1949, the location was shifted to Dharwad in October, 1949 and Karnatak University had its official inauguration in March 1950. The campus spans 750 acres . Dr. D. C. Pavate was the vice-chancellor of the university from 1954 to 1967...

, Dharwar . The department was started in the year 1956 under the leadership of Iyengar.

Iyengar received a D.Sc. (c.c) from Calcutta University, Calcutta. After retiring from the Central College of Bangalore University, he joined the Karnataka University, Dharwar in 1956 and retired from there in 1965. He worked in differential geometry and Riemannian geometry

Riemannian geometry

Riemannian geometry is the branch of differential geometry that studies Riemannian manifolds, smooth manifolds with a Riemannian metric, i.e. with an inner product on the tangent space at each point which varies smoothly from point to point. This gives, in particular, local notions of angle, length...

. Iyengar wrote a book The History of Ancient Indian Mathematics (1967 - World Press)