DOCS.

223,

224

MAY-JUNE

1916 217

Vgel

can

be ordered

according

to

pa

and derivatives

paB.

Then results

Vs«'

=

E^p“

+

E

Q

aß

where

the

AAa’s

and

BABa's

are no

longer dependent

on

vector

p.

If

I

substitute

this

in

the

above

equation,

I

can

then

write out

Ealda/dwlpa+EaBt=0

If this

equation

should be valid for

any

selection of

pa,

the

BalB's

must first vanish

owing

to

the

independence

of the

paBl's.

Because of

the

independence

of

the

Paß's,

the

individual

Ala’s

must

then

also

vanish,

however,

which would rob

the

theorem

of

its

sense.

How is

this cleared

up?

It

would

suffice,

of

course,

if

you

would

charge

Miss

Noether with

explaining

this to

me.[13]

Cordial

greetings

to

you

and

Mrs.

Hilbert, yours,

A. Einstein.

224. To

David Hilbert

[Berlin,]

2

June

1916

Dear

Colleague,

Your

new

explanation

has

dispelled my

doubts

on

this point

as

well.[1]

I

really

had

failed to notice

that

paBl

=

palß.

Thus

an

equation

in the form

Edav

=

0

remains,

which describes

precisely

the

conservation

law

in

common

form,

while

the other

two

relations

just

define

the

BlBa's,

which

are uninteresting

of

themselves,

as

it

seems.

Now

your

entire

fine

analysis

is clear to

me,

also with

respect

to

the

heuristics.

Our

results

are

in

complete agreement.

Unfortunately I

cannot

come

to

Göttingen

now.

However,

I

shall

try

to

break

myself

loose at

the

end of

July.

What

I appreciate

long

after

every

discussion

with

you

is

the

far-reaching

concurrence

of

our

views

and convictions.

Thanking

you

heartily

for

the

kind

explanations,

I

am

with best

regards,

yours,

A.

Einstein.