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首页> 外文期刊>Journal of algebra and its applications >On 2-star-permutability in regular multi-pointed categories
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On 2-star-permutability in regular multi-pointed categories

机译:常规多点类别中的2星置换

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摘要

2-star-permutable categories were introduced in a joint work with Janelidze and Ursini as a common generalization of regular Mal'tsev categories and of normal subtractive categories. In the present paper, we first characterize these categories in terms of what we call star-regular pushouts. We then show that the 3×3 Lemma characterizing normal' subtractive categories and the Cuboid Lemma characterizing regular Mal'tsev categories are special instances of a more general homological lemma for star-exact sequences. We prove that 2-star-permutability is equivalent to the validity of this lemma for a star- regular category.
机译:在与Janelidze和Ursini的联合研究中引入了2星可置换类别,作为常规Mal'tsev类别和常规减法类别的通用概括。在本文中,我们首先根据所谓的常规星形推出物来描述这些类别。然后,我们证明表征正常的“减法”类别的3×3引理和表征常规的Mal'tsev类别的长方体引理是恒星序列更一般同源引理的特殊实例。我们证明了2-star-permutability等同于该引理对于star-regular类别的有效性。

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