120 DOC. 25
FIELD
EQUATIONS
OF GRAVITATION
a
(10)
Our additional
term
insures that these
equations carry
no
additional conditions when
compared
to
(9);
we
thus need
not
make other
hypotheses
about the
energy
tensor
of
[p.
847]
matter other than
that it
complies
with the
energy
momentum
theorem.
With
this,
we
have
finally completed
the
general theory
of
relativity
as a
logical
structure. The
postulate
of
relativity
in its
most
general
formulation
(which
makes
space-time
coordinates into
physically
meaningless
parameters)
leads
with
compelling
necessity
to
a
very specific theory
of
gravitation
that also
explains
the
movement
of
the
perihelion
of
Mercury. However,
the
postulate
of
general relativity
cannot
reveal
to
us anything new
and different about the
essence
of the various
processes
in nature
than what the
special theory
of
relativity taught us already.
The
opinions
I
recently
[4]
voiced here in this
regard
have been in
error. Every physical theory
that
complies
with the
special theory
of
relativity
can,
by
means
of the absolute differential
calculus,
be
integrated
into the
system
of
general relativity
theory-without the latter
providing any
criteria about
the
admissibility
of
such
physical
theory.
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