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