From the reviews: "Volume 1 covers a basic course in real analysis of
one variable and Fourier series. It is well-illustrated, well-motivated
and very well-provided with a multitude of unusually useful and
accessible exercises. (...) There are three aspects of Courant and John
in which it outshines (some) contemporaries: (i) the extensive
historical references, (ii) the chapter on numerical methods, and (iii)
the two chapters on physics and geometry. The exercises in Courant and
John are put together purposefully, and either look numerically
interesting, or are intuitively significant, or lead to applications. It
is the best text known to the reviewer for anyone trying to make an
analysis course less abstract. (...)" The Mathematical Gazette
(75.1991.471)