• Aucun résultat trouvé

A correction

N/A
N/A
Protected

Academic year: 2022

Partager "A correction"

Copied!
2
0
0

Texte intégral

(1)

C OMPOSITIO M ATHEMATICA

H. S. T HURSTON A correction

Compositio Mathematica, tome 6 (1939), p. 478

< http://www.numdam.org/item?id=CM_1939__6__478_0 >

© Foundation Compositio Mathematica, 1939, tous droits réservés.

L’accès aux archives de la revue « Compositio Mathematica » ( http:

//http://www.compositio.nl/ ) implique l’accord avec les conditions gé- nérales d’utilisation ( http://www.numdam.org/conditions ). Toute utili- sation commerciale ou impression systématique est constitutive d’une infraction pénale. Toute copie ou impression de ce fichier doit conte- nir la présente mention de copyright.

Article numérisé dans le cadre du programme Numérisation de documents anciens mathématiques

http://www.numdam.org/

(2)

A Correction

by

H. S. THURSTON

University

of Alabama

In the paper

"On Factoring

a Matric

Polynomial

with Scalar Coefficients"

[Compositio

Mathematica

6, 234-238 ],

the statement was made that of the 36 factorizations of a certain

polynomial

13 are dissimilar. The correct number of dissimilar factorizations is 10. The error arose from a too strict

application

of

Theorem 2 to the

example.

While Theorem 2 is correct in its statement of a sufficient condition for the

similarity

of the sets

{Xi}

and

{Yi},

the

rearrangement

within the matric

symbols

need not be

cyclic.

It is sufficient that the matrices

of {Yi}

be formed

by subjecting

every matrix of

(X,)

to the same

rearrangement.

For the canonical

form,

this involves the same

rearrangement

of rows and columns in every

A i,

which is effected

by transforming

the

.A; by

the same unimodular matrix

Q.

This

condition is necessary as well as sufficient for the

similarity

of

{Xi}

and

{Yi}.

(Received

December

20th, 1938.)

Errata

L’équation dz/dt = w(z)

=

fonction holomorphe à partie réelle positive dans

un

demi-plan

par

J. WOLFF Utrecht

(Compositio

Mathematica

6, 2962013304).

A cause d’une erreur les fautes suivantes n’ont pas été

corrigées:

p.

297, 1. 22,

lire

p.

299,

1.14

(formule 5), lire

au lieu

de f dans le second membre;

BIBLIOTHEOUE

p.

300, 1. 31,

lire

e2

au

lieu.

de

2 , GRENOBLE

p.

304, 1. 12,

lire yt au

lien

de

y. J 4’/ V.. AIRE

Les

tirages

à

part.de

ce

mémoire

ne.

contiennent des fautes.

p.

302,

1.

35,

lire

,rk extremitè

ni

point lntérier

eu lieu de ,spas extrémité".

Références

Documents relatifs

G ROEMER , Geometric applications of Fourier series and spherical har- monics, Encyclopedia of Mathematics and its Applications, Cambridge Univ.. Press,

Although the necessary and sufficient condition of Theorem 4.1 is a key step to understand the problem of non uniqueness of the Fr´ echet mean on S 1 , it is of little practice

Our result is a sufficient condition for the convergence of a finite state nonhomogeneous Markov chain in terms of convergence of a certain series.. Definition

A recent such example can be found in [8] where the Lipscomb’s space – which was an important example in dimension theory – can be obtain as an attractor of an IIFS defined in a

Keywords: Formalization · Software development process · Software · Productivity · Constant speed · Sufficient condition · The Open-Closed Principle..

In this work, there is not only a general demonstration of the Kac-Rice formula for the number of crossings of a Gaussian processes, but also formulas for the factorial moments of

To study the well definiteness of the Fr´echet mean on a manifold, two facts must be taken into account: non uniqueness of geodesics from one point to another (existence of a cut

In this section, we prove the existence of a solution of problem (3.2) for the case where the discrete measure is not concentrated on any closed hemisphere of S n−1 and satisfies