# Distance-Regular Graphs

In 1989 Springer Verlag published
A. E. Brouwer, A. M. Cohen & A. Neumaier,
*Distance-Regular Graphs*,
Ergebnisse der Mathematik 3. Folge, Band 18,
Springer,
Berlin, etc., 1989.

ISBN 3-540-50919-5, 0-387-50919-5.

Current editions have ISBN 978-3-642-74343-6, and Springer also
provides an on-line edition with ISBN 978-3-642-74341-2
(even though they do not own the copyright of this text).

## Book Errata

(i) Additions and corrections to this book were collected the subsequent
few years (say, 1990-1995) in the file "Additions and Corrections"
(PostScript, 53 pp.).
(ii) Fréderic Vanhove pointed out a mistake in Theorem 12.1.1.
A writeup (PDF)
giving the corrected details.

(iii) There is a typo in Proposition 10.7.4 (p. 337) in the
formula for p^{i}_{jr}: the final factor
should be (q^{|r|}−1) instead of (q−1).
See also Parameters
of Lie geometries.

(iv) Dima Paduchikh and Jack Koolen pointed out that on p. 169, Remark (iii)
the restriction `*i* < *d*' is needed.

## Additions

This book was fairly complete when it came out, but that is long ago,
and since then there has been a lot of progress. A survey of later
developments is given in
E. R. van Dam, J. H. Koolen & H. Tanaka,
*Distance-regular graphs*,
Electr. J. Combin. (2016)
#DS22.