Algebraically degenerate solutions of the Einstein and Einstein‐Maxwell equations are studied. Explicit solutions are obtained which contain two arbitrary functions of a complex variable, one function being associated with the gravitational field and the other mainly with the electromagnetic field.

1.
R. P.
Kerr
,
Phys. Rev. Letters
11
,
237
(
1963
).
2.
R. P. Kerr and A. Schild, Atti Del Convegno Sulla Relatwità Generate: Problemi Dell’ Energia E Onde Gravitazionali (Anniversary Volume, Fourth Centenary of Galileo’s Birth), G. Barbéra, Ed. (Firenze, 1965), p. 173;
Applications of Nonlinear Partial Differential Equations in Mathematical Physics, Proceedings of Symposia in Applied Mathematics (American Mathematical Society, Providence, R.I., 1965), Vol. XVII, p. 199.
3.
G. C. Debney and R. P. Kerr, report of work prior to publication (1968).
4.
I.
Robinson
,
J. R.
Robinson
, and
J. D.
Zund
,
J. Math. Mech.
18
,
881
(
1969
);
I. Robinson and J. R. Robinson, Intern. J. Theoret. Phys. (to be published).
5.
H. R. Strauss, Ph.D. dissertation, The University of Texas at Austin, 1969;
I. Robinson, A. Schild, and H. R. Strauss, Intern. J. Theoret. Phys. (to be published).
6.
Throughout, complex conjugation will be denoted by a bar.
7.
R. K.
Sachs
,
Proc. Roy. Soc. (London)
A264
,
309
(
1961
);
J. N.
Goldberg
and
R. K.
Sachs
,
Acta Phys. Polon.
22
,
13
(
1962
);
I.
Robinson
and
A.
Schild
,
J. Math. Phys.
4
,
484
(
1963
).
8.
Degenerate vacuum solutions with Z = 0 have been studied by
W.
Kundt
,
Z. Physik
163
,
77
(
1961
).
9.
In Kerr’s paper (Ref. 1), a different choice was made for r, namely r = Re(Z−1). The present choice of r results in somewhat simpler expressions.
10.
The sign of the parameter a is opposite to that used in earlier papers (Refs. 1 and 2). The sign of a has been chosen here so that, in the asymptotically flat coordinates of Sec. 7, the z component of the angular momentum will be+am.
11.
The complex function Y is the ratio of the two components of the spinor which corresponds to the null vector e3. The special case e3 = dυ can be included by a limiting process, e.g., by starting with (1+YȲ)−1e3 and then letting Y→∞.
12.
E. T.
Newman
,
E.
Couch
,
K.
Chinnapared
,
A.
Exton
,
A.
Prakash
, and
R.
Torrence
,
J. Math. Phys.
6
,
918
(
1965
).
13.
B. Carter, report of work prior to publication, 1968.
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