Homology in Group Theory

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359 Urs Stammbach Eidgen6ssische Technische Hochschule, ZLirich/Schweiz

Homology in Group Theory

Springer-Verlag Berlin. Heidelberg • New York 1973

AMS Subject Classifications (1970): 20J05 ISBN 3-540-06569-5 Springer-Verlag Berlin • Heidelberg • N e w York ISBN 0-387-06569-5 Springer-Verlag N e w Y o r k • Heidelberg • Berlin This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machine or similar means, and storage in data banks. Under § 54 of the German Copyright Law where copies are made for other than private use, a fee is payable to the publisher, the amount of the fee to be determined by agreement with the publisher. © by Springer-Verlag Berlin . Heidelberg 1973. Library of Congress Catalog Card Number 73-19547. Printed in Germany. Offsetdruck : J ulius Beltz, Hemsbach/Bergstr.

INTRODUCTION The purpose braist group

of

may

these

learn

theory,

Notes

something

second,

methods

are

Chapter

I introduces

able

to a c h i e v e the

II w e h a v e

of groups.

Together

Chapters

as

far as

III,

applications extensions central

with

to b e

determined

being

that

tools

are

trary

variety

in all the

by

to

homological

some b a s i c

notions

facts

in g r o u p

about

the

to the

theory.

(co)homology

[43]

this will

(co)homology

theory

for t h e s e N o t e s .

the c o r e but

of this

volume.

not entirely

in a v a r i e t y ,

on central

We present

disjoint

theorems

extensions,

~

the

functors.

The group

[26],

V

areas:

o n the

localization

here

(a g r o u p

to

H2

it

. These

say

lower of n i l -

, H2

make

their

by Hopf

In a c e r t a i n

isomorphic

to)

in o r d e r

the

guide

about

the h i s t o r y

second

H2

appearances

, H2 • of t h e s e as

Eilenberg-MacLane

however

in 1 9 0 4

line

to an a r b i -

functors

first

was

homological

generalize

[46],

to s t u d y

a mild

group

sense

that

of t o p i c s

the main

functors

something

is w e l l - k n o w n

the m u l t i p l i c a t o r

the a u t h o r ,

(co)homology

in p a p e r s

[20].

of

the c h o i c e

of applications

, V

second

functors

for e x a m p l e

introduced

areas

functor

Eckmann

complete;

the p r e f e r e n c e

functors

the p l a c e

homology

in a n y w a y

four

It m a y be

group,

theory

groups.

largely

older;

alge-

field.

introduction

kernel

theorems

see w h a t

VI of Hilton-Stammbach

it is n e e d e d

abelian

the homological of h o m o l o g y

may

the basic

Chapter

form

own

to

in four d i f f e r e n t

We do n o t c l a i m

[25],

in his

complete

IV, V, V I

series,

potent

theorist

reader

with

First,

applications

assembled

as a r e a s o n a b l e

of groups

about

the g r o u p

In C h a p t e r

serve

is t w o f o l d .

they are much

Schur

integral

projective

[72],

[73]

homology representations

iv of a group. H2(G,A) [71