DOC.
1
MANUSCRIPT ON
SPECIAL RELATIVITY 87
four-dimensional
form[115]
(-K)
=
(Tvp/xp)
...(85)
or
in
a more
detailed notation
;
in
the
a
absence of external forces,[116]
\
_fx
=
^
\
dx
w2
dx
,A,2
dv
+
u,2
dz
+
dt
where
we
have
set
for
brevity
*'
=
I
+
Tx
a,A)
+
Ty
(M"q'
+1
XqA)
+ 5H)
1
dp
d
(Xqx)
-^-(Xqy)
-4(H) dX
-I
c
2
dt dx
dy
dz
~dt'
J
V(85a)
[p.
70]