DOCS. 174-176 DECEMBER
1915 169
Now I
believe
I
have
answered,
admittedly
briefly,
everything.
It would be
much nicer
orally.
Write
again
soon,
yours,
Einstein.
A
little letter
to “the charmer
[den
Holder]”
had
accidentally slipped
into
your
letter
to
me.
175. To
Wladyslaw
Natanson
[Berlin,]
29
December
1915
Dear
Colleague,
I
am
very
ashamed of
myself
that
I
still have
not
answered
your
kind
little
letter.
I
was
most
acutely
ashamed
yesterday
when in
addition
I
received
your
friendly
congratulations.
I also wish
you
health and
happiness
at work
for
the
coming year.
As
long as
you
were
here, you
were
my
favorite
Berliner;
now
I
miss
our
relaxed relations
very
much.[1]
I
am
sending you some
papers.[2]
You
see
that
I have
upturned
my
house
of
cards
once
again
and have
built
a new one;
the
middle section at least
is
new.
The
explanation
for
the
perihelion
motion
of
Mercury,
which
is
empirically completely
secure,
gives me
great
pleasure,
no
less
the
fact
that
now
general
covariance of
the
gravitation
law could be carried
out
after
all.
Cordial
greetings
to
you, your family &
our
coll.
Smoluchowski,[3] yours,
A.
Einstein.
176. To Karl Schwarzschild
[Berlin,]
29
December
1915
Highly
esteemed
Colleague,
Your calculation
providing
the
uniqueness proof
for
the
problem[1]
is
extremely
interesting.
I
hope you publish
it
soon![2]
I
would not have
thought
that the strict
treatment
of
the
[mass-]point
problem
was so
simple.
That
your
particular
solution is of
the
3rd order is
immediately
apparent
for
reasons
of dimension.
For
km/r
is
a
dimensionless number. As
your
ß
must
depend
on
m, your expression
_
axPx*
,
x
ß
9p°
~
ß
r5
+^3r3,
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