66
DOC.
7
RELATIVITY
LECTURE
NOTES
Impulssatz.
Maxwell'sche
Spannungen.
R
=
edive
+
[rot
h
,h]
+h)
div
h
+ [rote,
e]

1/c
[
de
dt
,
h
1
e,
dh
d/dt {1/c[e,
h]}
ex(dex/dx+dey/dy+dez/dz)+[ez(dex/dzdez/dx)ey(dey/dxdex/dy)])
o x x
 
o
dez/dydey/dz
de2x/dxd/dx(e2/2)+dexey/dy+dexez/dz
Setzen wir
p11
=
e2/2exex
p12
=

exey.
p13
=

exez.
etc.,
so
erhalten
wir
Rx
=
dp11/dx dp12/dy
dpl3/dz
d/dt
sx
2
c
AD.
[3
008].
This document
is
preserved
in
a
notebook,
17.5
x
21.5
cm,
of white
squared pa
per,
and
is
mostly
written
in
ink,
with
some
portions
in
pencil.
On the inside
of
the front
cover
Einstein has noted "Relativität
Vorlesung"
Winter 191415," and
in
the
upper
righthand
corner
"Blaschke
Belzigerstr
63."
On
the back
cover
Einstein has written the words "Statistische Me
chanik 1913."
Pagination
in
square
brackets refers
to pages
in
the notebook and
is
displayed
in
the outside
margins
of
the
transcription. Pages
that
are
omitted,
such
as
blank
pages
or
pages
containing
unrelated
material,
are
not
numbered.
The notebook contains the
text presented
here
as [pp.
119].
It also contains the
following
additional
material,
which
is
omitted:
one
page
of calculations
involving
retarded
potentials,
one
page
of
calculations
of the
mean
energy
of
a
quantized system,
four
pages
of
calculations
on
gravitational
waves
(related to
Einstein
1918),
four
pages
of calculations
on
general
rela
tivity, including equations
of
motion,
one
page involving
the
quantized energy
of
a
rotator,
three
pages
of calculations
on
general relativity,
five
more on
gravitational
waves,
one
page
on
the
energy
of
a
crystalline
medium,
another
six
pages on
gravitational
waves,
six
pages
of
calculations
on
general
relativity involving
variational
calculus, two
pages
on
the
quantum
ro
tator,
and
five
pages
on
the
elliptic
metric.
Following
these
pages
there
is
a
part
that
is
written
upside
down and
starts
from the back.
Observing
the
sequence
from the
back,
the
following
topics
are
covered: three
pages
of introduction
to
statistical mechanics
(Lagrange equations,
probability, averages), two pages
of the Newtonian
approximation,
one
page
of calculations of
derivatives
of
a
potential
function,
one
page
with
a
derivation of
Langevin's
formula for the
magnetization
of
a
paramagnetic gas (similar to
the
one
in Vol.
3,
Doc.
4,
[p.
39]),
and
five
pages
on
general relativity.