DOCUMENT 461 FEBRUARY 1918
641
units
is
no longer (2)nR but (2)nCR. The equation
p =
2/K(CR)2
obtained for the metric multiplied
by
C
(see
Doc.
456,
note
8)
thus
expresses exactly
the
same relationship
between the
density
and the
circumference
of
the universe
as
Einstein’s
equation
above.
[6]Einstein
1916f,
the
separatum
version
of
Einstein 1916e
(Vol. 6,
Doc.
30).
[7]For Mie,
the
importance
of
general
covariance
was
that it allowed
a generalization
of
his
own
principle
of
the
relativity
of
the
gravitational potential (see
Mie
1917c, p.
598;
see
Doc.
346, note
3,
for
further
discussion).
[8]The
justification
of
Einstein 1917b
(Vol.
6,
Doc. 43) offered below is
essentially
the
argument
given
in
the
paper
itself.
[9]Einstein’s
response
to
Mie’s
rejection
of
speculation
about what
happens
at
infinity
(in
Doc.
456)
is
very
similar
to
his
response
to De Sitter’s
criticism of
an
earlier
attempt
to
find
a
satis-
factory
treatment
of
boundary
conditions in
the
context
of
relativity theory
(see
Doc.
273).
[10]In
Einstein
1918f
(Vol.
7,
Doc.
4),
completed
in
early March,
the
term
"Mach’s
principle"
is
introduced
for
this
requirement.
For
an
earlier
statement
of
the
requirement
that the metric field be
fully
determined
by
matter, see,
e.g.,
Doc. 317.
[11]Einstein
had
come
to the conclusion that De Sitter’s alternative solution
of
the field
equations
with
cosmological
term (see
Doc.
313)
has
a singularity
and that
matter
is concentrated
on
this sin-
gularity
(see
Doc. 370 and Einstein 1918c
[Vol.
7,
Doc.
5]).
[12]See
Doc.
456,
note
13,
for
more
details about this
example.
[13]A reference
to
the so-called
point
coincidence
argument
(see,
e.g.,
Doc.
173
and Einstein 1916e
[Vol.
6,
Doc.
30],
p.
776).
[14]Three
days
earlier,
Mie had
complained
of
restrictions
on
civilian traffic
(see
Doc.
456).
[15]Schlick
1917b. For Einstein’s
description
of
it
or
of
the
earlier
journal
version
(Schlick
1917a)
as
"masterful,"
see
Doc. 453.
[16]Arnold
Berliner
was
the
editor of
Die
Naturwissenschaften,
the
journal
in which Schlick 1917a
was published.
461. From Emil
Warburg
Charlottenburg,
Marchstraße 25b
8
Febr.
1918
Hochverehrter
Herr
Kollege!
Besten Dank für Ihren freundlichen
Brief
vom
5t.
d.
Ich bin
allerdings
zu
etwas
anderen
Anschauungen gelangt.
I.
In die
+
Säule wandern Anionen
(Elektronen)
an
der
Kathodenseite,
ebenso-
viele Kationen
an
der Anodenseite herein. Aus einem
Grunde,
über den ich
nur
mutmaßen
könnte,
rekombinieren diese Ionen nicht mit einander.
Ich betrachte im
Folgenden
nur
den Fall
völlig
"elastischen" Stoßes zwischen
Elektronen und Gasmolekülen.
II Die Stromstärke in der Volumeneinheit und
[sc.?] ist,
in Ihrer
Bezeichnung
i

A.
und wird in zweierlei Weise verbraucht
1)
auch bei
völlig
elastischem
Stoß teilen die Elektronen den Gasmolekülen En-
ergie
(als Wärme)
mit
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