University of the Punjab.

1. Lorentz, G. G., Approximation of Functions, AMS Chelsea publishing, 2005. 2. Mhaskar, H. N. and Pai, D. V., Fundamentals of Approximation Theory, CRC Press, 2000. 3. Powell, M.J.D., Approximation Theory and Methods, Cambridge University Press, 2001. 4. Rivlin, T. J., An Introduction to the Approximation of Functions, Dover Publications, 1981. 5. Trefethen, L. N., Approximation Theory and Approximation Practice, Society for Industrial and Applied Mathematics, 2013.

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