In algebra, the principal factor of a J {\displaystyle {\mathcal {J}}} -class J of a semigroup S is equal to J if J is the kernel of S, and to J ∪ { 0 } {\displaystyle J\cup \{0\}} otherwise. == Properties == A principal factor is a simple, 0-simple or null semigroup.
In algebra, the principal factor of a J {\displaystyle {\mathcal {J}}} -class J of a semigroup S is equal to J if J is the kernel of S, and to J ∪ { 0 } {\displaystyle J\cup \{0\}} otherwise. == Properties == A principal factor is a simple, 0-simple or null semigroup.
Source: Wikipedia "Principal factor" · CC BY-SA 4.0
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