DOC.
14 EINSTEIN
AND BESSO
MANUSCRIPT
387
[p. 13]
(Einstein)
[65][P. 12]
and
[p. 13] are on
two
sides
of
one
sheet.
[66]Most equations
on
[p. 13]
duplicate
material
on
[p.
1]
having
to
do
with
finding
the metric
field
of
a
static
sun
to first
order.
[Eqs.
91,
92, 93,
and
95] on [p.
13]
are equivalent
to
[eqs.
2, 4,
5,
and
3]
on [p. 1],
respectively.
The factor
c20
in
the
first
line of
[eq. 96]
clearly
should
be
1;
the
equation
then becomes identical
to
[eq.
6]
on [p. 1].
[67][Eq.
94]
is
the
Euler-Lagrange equation
for
a
point
mass
moving
slowly
in
a
static metric
field (see
[eq.
54]
on [p.
8]).
The
square
root
signs
abbreviate ds/dt
(see
[eq.
52]
on [p. 8]).
Comparison
of
[eq.
94]
with Newton's second
law
for
this
case
gives [eq.
95] (compare
this
quick
derivation of
the
relation between
K
and
K
with Besso's
attempts
on [p.
52]
to
derive this
relation;
see
note
242).
The form of
[eq.
94] directly
entails the "area law"
(see
[eq.
56]
on [p.
8]), as
is
shown
in
[eq. 97].
W
=
ds/dt
(see
[eq. 105] on
[p.
15]),
f
denotes the "area
velocity"
(see
[eq. 57] on [p. 8]).
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