DOC. 28 NORDSTRÖM'S

THEORY OF GRAVITATION

597

Published

in

Annalen der

Physik

44

(1914):

321-328. Received

19 February 1914, published

12 May

1914.

[1]For

a

brief discussion of Einstein

and

Fokker's

collaboration,

see

the

editorial

note,

"Einstein

on

Gravitation

and

Relativity:

The Collaboration

with

Marcel

Grossmann,"

pp.

299-

300.

See

also Norton 1992b for

a

discussion of

this

paper.

[2]Nordström

1913b and Einstein 1913c

(Doc. 17).

For

a

historical

study

of Nordström's

work,

see

Isaksson

1985.

[3]For

a

discussion of Einstein's

recognition

of

the

analogy

between the mathematical

prob-

lem

posed

by a

generalized theory

of

relativity

and

the

Gaussian

theory

of

surfaces,

see

the

editorial

note,

"Einstein's Research Notes

on a

Generalized

Theory

of

Relativity,"

pp.

193-

195.

[4]This

section summarizes results

presented

earlier

in

Einstein and Grossmann

1913

(Doc.

13), part

1,

§6,

and Einstein 1913c

(Doc. 17), §5.

[5]Einstein

and Grossmann

1914a,

published

earlier

as

Einstein and Grossmann

1913

(Doc.

13).

[6]For

the notion of

"naturally

measured interval"

("näturlich

gemessenen

Abstand"),

see

Einstein and Grossmann

1913

(Doc. 13), part

1,

§3.

[7]This

parallelism

between Euclidean

and

generalized vector analysis

is

developed

in

Ein-

stein and

Grossmann 1913

(Doc.

13),

part 2.

For

a

discussion

of

the

historical

context

of

this

argument,

see

Reich

1994,

sec.

5.3,

and Norton

1992a,

pp.

302-310.

[8]See

Einstein 1913c

(Doc. 17),

p.

1257.

[9]See, e.g.,

the

discussion

in

Laue

1913,

§28,

and

[pp.

65-68]

of Einstein's

unpublished

manuscript

on

special relativity

(Doc.

1).

[10]For

Einstein's earlier discussion of Nordström's

theory,

see

Einstein 1913c

(Doc. 17),

§2.

[11]Einstein's earlier derivation of Nordström's

field

equation

was

based

on a

consideration

of conservation

laws,

a

consideration

analogous

to

the

one

by

which Einstein had

obtained the

field

equations

of his

own

theory (see

Einstein 1913c

[Doc. 17],

p.

1254).

[12]See

Bianchi

1896, chap.

2.

[13]See

Einstein 1913c

(Doc.

17), p.

1253.

[14]"guv"

should

be

"yuv"

[15]For

a

similar

comment

on

Nordström's

theory,

see

Einstein

1913c

(Doc.

17),

p.

1254.

[16]See

Einstein and Grossmann

1913

(Doc. 13), part

2,

§4,

p.

36,

where Einstein and Gross-

mann

reject

the

Ricci tensor,

derived from the fourth-rank Riemann

tensor,

as a

possible can-

didate for

a

gravitational tensor.