DOCS. 390-392
OCTOBER
1917 387
Theorem
In
a
triangle,
the
corners
of which
are
the
height
and
base
points
of
a
triangle,
the
heights
halve
the
angles.
The
heights
A
A',
etc.,
halve
the
angles
B'
A'
C',
etc.
I
now
live at
5
Haberland St.
391. To
Werner Weisbach
[Berlin,]
15
October
1917
Esteemed
Colleague,
Quite
belatedly
I
declare
my
approval
of
the
decisions reached
by
the
“Asso-
ciation of
the
Like-Minded”
on
30
May
1917.[1]
I
was
pleased
that the
danger
of
fragmentation,
which all associations face
that
are
based
on
their
members’
ideals,
not
on
realistic
aims,
has been eliminated.[2]
I
intend
to make
it
my
business
to win
over
colleagues
to this
organization.
The
ex-
perience
of the
last
few weeks
has
unfortunately
shown
again
how
deeply
anchored
the
religion
of
might
is
among
German
academics.[3]
Hard
experience
certainly
will
work
incomparably
more
in
our
direction
than
our
conscious
advocacy can;
yet
this little
must
occur
nonetheless,
if
only
to
spare
the
enlightened
of
the
discouraging feeling
of isolation.
With
cordial
regards,
I
am
very
truly
yours,
A.
Einstein.
392.
From Edouard Guillaume
Berne,
17
October
1917
Dear
Einstein,
When
integrating,
the
integration
constants do not have to be
omitted![1]
The
equations:
du du'
,
~dt=c’
~dt
=
C
upon
integration
result
in:
u
=
ct
+
r
u'
=
c't +
r',
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