188
DOC.
8
REPLY TO
A
COMMENT
BY M. ABRAHAM
dimensional
gradient; equation
(6)
relates the
velocity
of
light
c
at
some
point
of
space-time
to the
gravitational potential
at
that
point
by
c2/2
-
c20/2
=
Q
-
Q0,
where
c0
and
Q0
are
the
values
at the
origin
of
the
coordinate
system.
[19]See Abraham
1912f, p.
1058.
[20]See
Abraham
1912a,
p.
4,
and Einstein
1912d
(Doc. 4), p.
457.
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