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advanced_tools:category_theory:monoids [2017/11/10 09:43] jakobadmin [Student] |
advanced_tools:category_theory:monoids [2017/11/10 10:43] (current) jakobadmin [Student] |
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+ | A monoid is a generalisation of [[advanced_tools:group_theory|group]], in that the | ||
+ | requirement that each element has an inverse is dropped. | ||
<blockquote>what is a category with one object? It is a "monoid". The usual definition of a monoid is this: a set M with an associative binary product and a unit element 1 such that a1 = 1a = a for all a in S. [...] | <blockquote>what is a category with one object? It is a "monoid". The usual definition of a monoid is this: a set M with an associative binary product and a unit element 1 such that a1 = 1a = a for all a in S. [...] |