DOCS.
493,
494
MARCH
1918 515
chosen. On
the
basis
of
my exposition
of
1915,
therefore, absolutely
no
preferred
system
exists.
What
remained unresolved
then
was
how the structure of
the
universe
as
a
whole should
possibly
be conceived. One
reason
why
the
quasi-Euclidean
possibility
(A
=
0),
(gßU
=
const.)
does not
satisfy
me
is
presented
in
the
enclosed
notice.[3]
All
the
rest
orally.
With best
regards, yours truly,
A.
Einstein.
494. From Paul
Ehrenfest
[Leyden,]
27
March
1918
Dearest
Einstein,
Except
for
along
sl[ow]
indirect
routes,
I
have heard
nothing
of
you
for
a
long
while
now
and
only
little about
your
health.
But
I
think
of
you
often-my not
writing
stems from:
my
chronic discontent
with
work.-
But
no more
of
it!-
In
the last
few
months
I
became
enormously
fascinated
with
very specific
problems
of
politico-economic theory,
and
I
have been
reading up quite extensively
and
reflecting
on
the
entire
complex of
problems.[1] Natural[ly],
this
is
a
viol[ation]
of
my
professional
duties,
but it
has taken too
strong
a
hold of me-it can’t be
helped;
it
simply
fits
the
structure
of
my thinking
machine
so
well!
Every
time
I
suddenly
advance
again
to
a
bit
of
musical
insight
or
ability,
I
repeatedly
think
how nice
it
would be
if I
had
you
here.[2] We just
received
an
article
by
Sommerfeld in which he describes the
impressions
he
gained
on
the
occasion
of
physic[al]
lectures
at Ghent. I feel
the
urge
to write
him
some
details
about
some
of
the
gentlemen
whose
blather
have
fed
his
impressions.
We
know
them
here in
Leyden.-[3]
Hilbert and Planck have
remarkably kindly
invited
me
to
the
Wolfskehl-week
discussions[4]-I
wrote Hilbert
the
superficial
and
ideological
reasons
why
I
could
not come.[5]
Since
I
requested
that
he also
relay my
thanks
to
Planck,
I
would
appreciate hearing
from
you
whether
the letter
has arrived.
I
mean
to
Hilbert.-
Personally,
we are
doing
very
well,
and
the
joy
the
children
give us
is
beyond
description.-
Report
a
bit about
yourself.-
When
are
you
visiting us
here
again?!!
Fond
regards
from all of
us, yours,
Ehrenfest.
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