DOC. 27 MAXWELL'S
EQUATIONS
137
{3}
The first
two
summations
are
over
ja,
v,
the third
one over
\x,
v, a, ß,
and have
been added here.
{4}
The summations extend
over
the indices
p,
v,
a,
ß,
and have been added here.
{5}
The summation indices in the first
sum are
jx,
v, p, r;
in the second
sum
they
are a,
ß, p,
r.
They
have been
added
here.
{6}
The second
sum
extends
over
the three indices
\i,
v,
r,
which have been added
here.
{7}
"a
=
«"
has been corrected to
"a
^
v."