Unfolding all definitions, a magma $(X,\ast)$ fulfills the following single property:
Axiom: Axioms of Magma
closure: $x \ast y\in X$ for all $x,y\in X$.
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References
Bibliography
- Knauer Ulrich: "Diskrete Strukturen - kurz gefasst", Spektrum Akademischer Verlag, 2001
- Lang, Serge: "Algebra - Graduate Texts in Mathematics", Springer, 2002, 3rd Edition