Reprint of the original, first published in 1876.

Reprint of the original, first published in 1845.

This book is intended for those beginning their study of mathematics at the university level, as well as the general reader who would like to learn more about what it means to "do" mathematics.

Reprint of the original.

The author is well known for his clarity of writing and his many contributions as a researcher in approximation theory. This book covers the main topics concerned with interpolation and approximation by polynomials.