Geodesic
CONGRUENCE AND NON-CONGRUENCE SUBGROUPS OF THE (2,3,7)-GROUP
Glasgow mathematical journal, Tome 48 (2006) no. 3, pp. 351-363

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DOI

Let $\Delta$ denote the (2,3,7)-group. We establish an upper bound for the number of congruence subgroups of index $n$ and a lower bound for the total number of subgroups of index $n$. Since the latter grows more quickly, there exist non-congruence subgroups of index $n$ for all $n$ greater than some $n_0$.
DOI : 10.1017/S0017089506003223
Mots-clés : 10D05, 20H10 
STOTHERS, W. W. CONGRUENCE AND NON-CONGRUENCE SUBGROUPS OF THE (2,3,7)-GROUP. Glasgow mathematical journal, Tome 48 (2006) no. 3, pp. 351-363. doi: 10.1017/S0017089506003223
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     title = {CONGRUENCE {AND} {NON-CONGRUENCE} {SUBGROUPS} {OF} {THE} {(2,3,7)-GROUP}},
     journal = {Glasgow mathematical journal},
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     year = {2006},
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     doi = {10.1017/S0017089506003223},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089506003223/}
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