The Congruence package provides functions to construct several types of canonical congruence subgroups in SL_2(Z), and also intersections of a finite number of such subgroups. Furthermore, it implements the algorithm for generating Farey symbols for congruence subgroups and using them to produce a system of independent generators for these subgroups.
| Package Version | Update ID | Released | Package Hub Version | Platforms | Subpackages |
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| 1.2.1-bp153.1.12 info | GA Release | 2021-02-26 | 15 SP3 |
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| 1.2.1-bp152.3.13 info | GA Release | 2020-04-16 | 15 SP2 |
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| 1.2.1-bp151.2.10 info | GA Release | 2019-05-18 | 15 SP1 |
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| 1.2.1-bp150.1.3 info | GA Release | 2018-07-30 | 15 |
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