In mathematics, a semigroup is an algebraic structure consisting of a set together with an associative binary operation. A semigroup generalizes a monoid in that there might not exist an identity element. It also (originally) generalized a group (a monoid with all inverses) to a type where every element did not have to have an inverse, thus the name semigroup.
| Package Version | Update ID | Released | Package Hub Version | Platforms | Subpackages |
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| 0.20-bp155.2.16 info | GA Release | 2023-05-22 | 15 SP5 |
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| 0.20-bp154.1.11 info | GA Release | 2022-05-09 | 15 SP4 |
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| 0.19.1-bp153.1.20 info | GA Release | 2021-04-08 | 15 SP3 |
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| 0.19.1-bp152.1.16 info | GA Release | 2020-06-16 | 15 SP2 |
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| 0.18.5-bp151.2.2 info | GA Release | 2019-07-17 | 15 SP1 |
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| 0.18.5-bp151.1.13 info | GA Release | 2019-05-31 | 15 SP1 |
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| 0.18.3-bp150.2.4 info | GA Release | 2018-07-30 | 15 |
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| 0.18.1-6.7 info | 5585 | 2016-09-14 | 12 GA-SP5 |
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| 0.18.1-6.3 info | 5585 | 2016-09-14 | 12 GA-SP5 |
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| 0.18.1-3.1 info | openSUSE-2016-291 | 2016-07-04 | 12 GA-SP5 |
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