On subgroups of amalgamated free products
1971 ◽
Vol 69
(1)
◽
pp. 13-23
◽
Keyword(s):
In 1934 Kurosh(9) proved that ‘a subgroup of a free product of groups is again a free product’. Many other proofs of this, and attempts to generalize it to amalgamated free products, have appeared (e.g. (7), (1), (10) and (8)). Recently the theory of groupoids has been applied to this area with increasing success. In 1966 Higgins (6) used groupoids to prove the generalization of Grushko's Theorem (3) due to Wagner (14).
2006 ◽
Vol 81
(2)
◽
pp. 199-208
◽
Keyword(s):
1999 ◽
Vol 42
(3)
◽
pp. 559-574
◽
1993 ◽
Vol 36
(3)
◽
pp. 296-302
◽
1976 ◽
Vol 80
(3)
◽
pp. 451-463
◽
Keyword(s):
1991 ◽
Vol 33
(3)
◽
pp. 373-387
◽
Keyword(s):
1969 ◽
Vol 1
(1)
◽
pp. 11-13
◽
Keyword(s):
1989 ◽
Vol s3-59
(3)
◽
pp. 507-540
◽
1965 ◽
pp. 372-375
Keyword(s):