DOCS.
669,
670
DECEMBER
1918 709
of
this
unit
is
always
the
same
“pure
number
of
enormous
size”
mystery.
2)
d(mui)
ds
1 dgaß

,
mu
upa
2
dx
i
really are,
whether
m
is
constant
or
not,
the
components
of
a
coordinateinvariant
vector
(which
reduce to
d(mui)/ds)
in
a
coordinate
system
where
dyaB/dxi
=
0.[12]
3)
I
do not
understand what
you
mean
when
you say
that, in
my
derivation
of
the
equations
of
the
mechanics,
I “assumed
the
Qi's
do not
yield any moving
forces.”
4)
You repeat
without
any
backing
your
assertions
about the
geodesic
line
and
the
dependence
on
the
prehistory;
I
think
I
have
given reasons refuting
them
and
cannot
say
more
than that
on
it;[13]
maybe
also
just
this:
You
yourself
made
me aware
of
the
following:
If
the
geodesic
line
is
valid,
a
contradiction arises
with
the
energy principle;
but the
energy principle
is
valid in
my
theory
(it
is
precisely
from
it
that
the
equations
of
the
mechanics
are
derived);
ergo
...
Ergo,
you
will conclude:
he
is
beyond
help!
Perhaps
you
will make
one more
attempt,
even so,
in
February
when
you
are
here. And
what
should
happen
now
with
my script?
I
think
in its
existing
form[14]
it
was
suited
only
for
publication
in
the
Academy Berichte;
so
please
send it back to
me! I
shall
then
try to
find
a
place
for it elsewhere in
a
revised
form.[15]
Do
we
have
a
right
to
worry
about the
law
governing
the
remotest worlds
when
that
of
the
nearest is in
the
process
of such
tumultuous
change,
menaced
on
all sides
by peril
and
calamity?
Even
though
the
war
hatchet
between
us
has been
dug
up,
I
give
my
regards
in sincere
respect. Yours,
H.
Weyl.
670. From Heinrich Mousson
Zurich,
12
December
1918
To
Prof.
Einstein, Berlin, 5
Haberland
St.
The
Philosophy Faculty
II
of
the
University
of
Zurich
is petitioning to
have
a
teaching assignment
at
our
university
in
the
field of
theoretical
physics
issued to
you already
for
the
2nd
half
of
the current winter
semester, namely,
in
the
form of
twelve twohour lectures
which, subject
to
more
specific
fixing
with the
university
Rector’s
Office, are
to be
interspersed throughout
a
period
of
ca. 5
weeks.[1]