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1
BIRTH CERTIFICATE
Ulm,
15 March
1879
No.
224
Before the
undersigned registrar appeared today,
in
person
known,
the
merchant Herman Einstein
residing
in
Ulm Bahnhofstrasse
B
No. 135
of Israelite
religion,
and
reported
that to
Pauline Einstein
nee
Koch
his wedded wife
of Israelite
religion
who lives with him
in Ulm
in
his residence
on
the
four teenth of March
of the
year
one
thousand
eight
hundred
seventy-nine
in
the
morning
at
half-past
eleven o'clock
a
child
of male
sex
has been
born,
which
was
given
the first
name
Albert
Read,
approved
and
signed
Hermann Einstein
Registrar
Hartmann
2.
PAULINE EINSTEIN
TO FANNY
EINSTEIN
[Munich]
1
August
1886
Yesterday
Albert got his
grades,
once
again
he
was
ranked
first,
he
got
a
splendid
report card...
3.
COMMENT
ON
THE PROOF
OF A THEOREM
[1891-1895]
3d
Theorem.
The
cylinder
surface is
a
surface that
can
be spread out
or
unrolled into
a
plane
(surface
developpab1e).
* If
one
imagines that
one
places through
each of
several side
lines [generators]
of the
cylinder
surface
(a)
a
plane
that contains
this
and the next side
line, (b)
a
plane
that touches the
surface,
then
one
obtains
two
prismatic
spaces, one
that is
inscribed
within
the
cylinder
surface and
one
that circumscribes it. The
lateral
surface of each of these
prismatic
spaces can
be spread
into
a
plane,
inasmuch
as one can
imagine
that each of
the
constituent planes
rotates around
one
of its
bordering edges
until it falls onto the
extension of the
neighboring
plane
and then constitutes
one
single
plane
with it.
Since
the
surface of the
cylinder
lies between
the
lateral
surfaces of the
prismatic
spaces
and constitutes
the limit
3

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