418 DOC.

42

SPECIAL AND GENERAL RELATIVITY

Translations

of

editorial

notes

[4]...

and later additions:

"Appendix

to

the third edition.

This

year

(1918)

Springer-Verlag published

an

elaborate excellent textbook

on

the

general theory

of

relativity,

written

by

H.

Weyl

with

the title

Space.

Time.

Matter. It is

to

be

warmly

recommended

to

mathematicians and

physicists."

...

signed

on

November

9,

1920:

"More than

ever

it is

necessary

in

our

hectic

times

to nurture

those

things

which

can bring people

of

a

different

language

and

nation closer

to

each other

again.

From this

point

of view it

is

of

particular

importance

to

facilitate the

exchange

of scientific endeavors

even

under these

currently

difficult conditions.

I

am

glad

that

my

booklet will

now appear

in the

Russian

language,

the

more so as

Herr

Itelson,

whom

I

highly esteem,

is

guaranteed

to

provide

an

excellent translation. The author has often been scolded for

saying

his

booklet is

'intelligible

to

all';

and therefore the Russian reader who encounters

difficulties

in

comprehension

should

not

get angry

at

himself

or

Herr Itelson. The

really

guilty one

is

no one

other than the

author

himself."

...

Czech

translation

(Einstein

1923):

"I

am glad

that this little

booklet,

in which

the basic ideas of the

theory

of

relativity

are presented

without mathematical

formalism,

appears

now

in the national

language

of the

country

where I found the

necessary contemplation

to

gradually give

the

general theory

of

relativity

a more

precise

form,

an

endeavor whose basic idea

I

adopted already

in

1908.

In the

quiet

rooms

of the Institute of Theoretical

Physics

at the German

University

of

Prague,

in

Vinicna

ulice,

I discovered

in

1911 that the

principle

of

equivalence

demands

a

deflection of the

light

rays

passing by

the

sun

with observable

magnitude-this

without

knowing

that

more

than

one

hundred

years ago

a

similar

consequence

had

been

anticipated

from Newton's

mechanics

in combination with

Newton's emission

theory

of

light.

I

also discovered

at

Prague

the still not

completely

confirmed

consequence

of the redshift

of

spectral

lines.

However, only

after

my

return

in

1912

to

Zurich did

I

hit

upon

the decisive idea about the

analogy

between the mathematical

problem

connected with

my theory

and the

theory

of surfaces

by

Gauss-originally

without

knowledge

of the research

by Riemann, Ricci,

and Levi-Civita. The latter

research

came

to

my

attention

only

through my

friend Grossmann in Zurich when

I

posed

the

problem

to

him

only

to

find

generally

covariant

tensors

whose

components

depend only upon

the derivatives

of

the coefficients of the

quadratic

fundamental

invariant.

Today

it

appears

that

we

can

clearly recognize

the achievements and

limitations

of

the

theory.

The

theory provides deep insights

into the

physical

nature

of

space, time, matter,

and

gravitation,

but

no

adequate means

to solve the

problems

of

quanta

and the atomic constitution of

elementary

electric structures that constitute

matter."

...

...

The text

is:

"I added in

a

4th

appendix

an

exposition

of

my

views

on

the