ISSN:
1432-2137
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Mathematik
Notizen:
En = {(a,b,t) epsilon Z 3 : a 2 + b 2 = t n , n≥ 1, is free if and only if n is odd (Theorem 1). We extend the results of Lyndon and Ullman, and Beardon concerning the set of those rational numbers mu epsilon (-2,2) for which the matrix Möbius group G mu generated by A= and B = is not free (Theorems 2, 3, 4).
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/PL00006024
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