Some maximal normal subgroups of the modular group
1987 ◽
Vol 30
(1)
◽
pp. 97-101
Keyword(s):
For each finite group G, let G denote the set of all normal subgroups of the modular group Γ = PSL2(ℤ) with quotient group isomorphic to G; since Γ is finitely generated, the number NG = |G| of such subgroups is finite. We shall be mainly concerned with the case where G is the linear fractional group PSL2(q) over the Galois field GF(q), in which case we shall write (q) and N(q) for G and NG; for q>3, PSL2(q) is simple, so the elements of (q) will be maximal normal subgroups of Γ.
2011 ◽
Vol 03
(02)
◽
pp. 153-160
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1976 ◽
Vol 21
(1)
◽
pp. 49-55
◽
Keyword(s):
2007 ◽
Vol 142
(2)
◽
pp. 239-248
◽
Keyword(s):
1980 ◽
Vol 88
(1)
◽
pp. 15-31
◽
Keyword(s):
1972 ◽
Vol s3-24
(3)
◽
pp. 449-469
◽
Keyword(s):
1989 ◽
Vol 40
(1)
◽
pp. 109-111
◽
Keyword(s):
1974 ◽
Vol 77
(4)
◽
pp. 382-386
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