page 353: [second equation in section 14.2 Distance]

WAS: for all i, j, k, l.

IS: for all i, j, k.

Correction by Alessandro Rizzi, 11/12/96.

WAS: d(i,k) + d(j, l)=...=d(i,j) + d(j,k)

IS: d(i,k) +d(j,l) = ... = d(i,l) + d(j,k)

Correction by George Komatsoulis, 30/07/96

page 360:

WAS:

. . . \sum^n_{k=2} d(2,k) ) / 2
and
. . . \sum^n_{k=2} d(2,k) ) / 2.

IS:

. . . \sum^n_{k=3} d(2,k) ) / 2,
and d_2 from 2,
. . . \sum^n_{k=3} d(1,k) ) / 2.

Correction by Dick Hwang, 3 January 1997.

page 364:

Correction by Alessandro Rizzi, 11/12/96.

page 365, in summation for $||f||$,

WAS: x, y \notin \delta(v), x \in \pi(y)

IS: x, y \notin V(T(v)), x \in \delta(y)

Correction by

page 375:

WAS: Another approach must be take! n.

IS: Another approach must be taken.