DOCS.
299,
300
FEBRUARY
1917 287
better).
In
the
spring
or
In
the
summer
I
shall
definitely
come
to
see
you
in
Switzerland; traveling
is too repugnant
now,
especially
for
a
rickety
old
fellow.[7]
300. To
Erwin Freundlich
[Berlin,]
Sunday.
[18
February
1917
or later][1]
Dear
Freundlich,
I
have been
turning
the
elliptic space problem
over
in
my
mind and
understand
it
completely. My
calculation remains
correct,
in
particular,
the
relation between
A,
p,
and
R; only,
the total
volume is half
as
large
as
for the
originally spherical
space.[2]
The
elliptic space
is
simply
a
spherical one
in which
points
that
are
symmetric
with
respect
to
the
center
are
identical
(not distinguishable).
Put
another
way,
G
P
P'
Let G
and
G'
be
two
geodetic
lines
that
start
at
P.
These
same
lines intersect
each
other
at
P'.
According
to
spherical geometry,
P
and
P'
are
opposing points;
according
to
the
elliptic one, they
are
identical. An
elliptic space
can
aptly
be
described
as
“hemispherical.”
The star
statistics
question
has become
a
burning
issue to be addressed
now.[3]
I
suggest
that
we
discuss
the
problem
in
a
joint
paper.
If it
is
necessary
or
beneficial,
I shall seek to
have
you
granted
time
off
from
your
duties
for
a
specified
period.
We
must act
cautiously
in
doing this, though,
so
that
your
position
is
not
jeopardized.[4]
The
matter of great
interest here
is
that
not
only
R
but
also
p
must be indi-
vidually
determinable
astronomically,
the
latter
quantity at
least to
a
very rough
approximation,
and
that
then
my
relation between them
ought
to hold.
Maybe
the
chasm between
the
104
and
107 light years
can
be
bridged
after
all![5]
That
would
mean
the
beginning
of
an
epoch
in
astronomy.
The
paper by
Harzer
is
very
interesting.
If
only
it
were
known what should be done with
the
loathsome ab-
sorption;
it
is
so
abominably up
in
the
air.[6]
But
managing
without this
quantity
is
unfortunately
impossible.
Best
regards,
yours,
A. Einstein.
Previous Page Next Page

Extracted Text (may have errors)


DOCS.
299,
300
FEBRUARY
1917 287
better).
In
the
spring
or
In
the
summer
I
shall
definitely
come
to
see
you
in
Switzerland; traveling
is too repugnant
now,
especially
for
a
rickety
old
fellow.[7]
300. To
Erwin Freundlich
[Berlin,]
Sunday.
[18
February
1917
or later][1]
Dear
Freundlich,
I
have been
turning
the
elliptic space problem
over
in
my
mind and
understand
it
completely. My
calculation remains
correct,
in
particular,
the
relation between
A,
p,
and
R; only,
the total
volume is half
as
large
as
for the
originally spherical
space.[2]
The
elliptic space
is
simply
a
spherical one
in which
points
that
are
symmetric
with
respect
to
the
center
are
identical
(not distinguishable).
Put
another
way,
G
P
P'
Let G
and
G'
be
two
geodetic
lines
that
start
at
P.
These
same
lines intersect
each
other
at
P'.
According
to
spherical geometry,
P
and
P'
are
opposing points;
according
to
the
elliptic one, they
are
identical. An
elliptic space
can
aptly
be
described
as
“hemispherical.”
The star
statistics
question
has become
a
burning
issue to be addressed
now.[3]
I
suggest
that
we
discuss
the
problem
in
a
joint
paper.
If it
is
necessary
or
beneficial,
I shall seek to
have
you
granted
time
off
from
your
duties
for
a
specified
period.
We
must act
cautiously
in
doing this, though,
so
that
your
position
is
not
jeopardized.[4]
The
matter of great
interest here
is
that
not
only
R
but
also
p
must be indi-
vidually
determinable
astronomically,
the
latter
quantity at
least to
a
very rough
approximation,
and
that
then
my
relation between them
ought
to hold.
Maybe
the
chasm between
the
104
and
107 light years
can
be
bridged
after
all![5]
That
would
mean
the
beginning
of
an
epoch
in
astronomy.
The
paper by
Harzer
is
very
interesting.
If
only
it
were
known what should be done with
the
loathsome ab-
sorption;
it
is
so
abominably up
in
the
air.[6]
But
managing
without this
quantity
is
unfortunately
impossible.
Best
regards,
yours,
A. Einstein.

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