272 DOC.
283
DECEMBER
1916
Schwarzschild-Flamm
space?
Or
is
it rather
(since
one can
clearly speak
of
an
infinite velocity here)
that
geometry specifies
for
it the
solution to
the
motion
equations?
The
latter
seems
to
me
to be
the
case.-
In
mapping a
spherical
space
on
to
a plane space,
one can
(or must?) proceed
such
that the diminution
of
the
measuring
rod
images
in
the
mapping
is
investigated
as a
function of
the distance
from
an
intersection
point,
for which
the
“apparent”
circumference becomes
=
2n
sin
apparent
radius
-.
spherical
space
radius
Is
an
"isotropic"
representation adequate at
all,
namely,
can
it be assumed
that
the dimensions of the
measuring-rod
picture
are
independent
of its orientation with
regard
to
the
intersection
point?-
-This
mapping
possibility
ends for
an
“apparent”
radius
=
n-2
spherical
radius.
And
there
my ability
to
vizualize it also ends.
What
happens
when
the
density
of
the
spherical
mass or
the
size of
the
homogeneous sphere
is
even
greater?
Then
spaces
are
involved,
the
content
of
which
cannot
influence
the
outside
world,
can
it? The interior
of nuclear
spaces,
the
interior
of
the
celestial cosmos?
Is
the
solution for
the
gravitation
equations
of
a
spherical
shell
known?-[15]
Not
even
with Wiechert
am
I
quite
sure
about
myself.
I
lectured
unbendingly
and
firmly
that it
is
quite unforgivable
to
assume an
effect
on
gravitation
by
en-
ergy
and then
not
immediately
also
assume
that
amount
of
energy corresponding
to
the
equivalency
of
gravitational
and
inertial
mass.
And
this
is undoubtedly
right.
But what
is
not
just
as
clear
to
me is,
to
what
extent
the inertial
mass
is
given
or
suggested,
even
with
the
energy
without
the
special
theory
of relativ-
ity;
so
that
you
would have
another
proportionality
coefficient
available here just
loosely
connected
to
the electron
mass.
The
gravitational
influence
of gravitational
energy,
or
the latter
itself,
is
ulti-
mately
only
a
counter for
you,
isn’t it? On its
own,
it
has
no
tensor
properties;
it
is
negative
and therefore
(?)
has
no
place
in
your empty space.
Or read
correctly,
does
just
this last
paper
of
yours
answer
these
questions
otherwise?
Speaking
of
papers:
I
don’t have
your
gravitational
waves
paper.
Would
you
still be able to send
me a
reprint of
it? The
problem
of
whether
the
coordinate
system can,
in
principle,
be chosen
so
that the
apparent
solutions
do
not
appear
seems so
very
important
to
me!-[16]
An influenza of sorts
is
plaguing
Anna;
she
sends
warm greetings.
Still in
expectation of
it
(the influenza),
I
am
still
tolerably
well at
the
moment.-
Affectionately yours,
Michele.
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