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Normal subgroups of |
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| Authors: | Roger C Alperin |
| Institution: | Department of Mathematics and Computer Science, San Jose State University, San Jose, California 95192 |
| Abstract: | We classify the normal subgroups of ![$PSL_2(Z\sqrt {-3}])$](http://www.ams.org/proc/1996-124-10/S0002-9939-96-03429-6/gif-abstract/img2.gif) of index less than 960; they are all congruence subgroups. |
| Keywords: | Triangle of groups congruence subgroup property FA |
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