===== Unit element =====
==== Set ====
| @#55CCEE: context     | @#55CCEE: $\langle M,* \rangle$ ... magma |
| @#FFBB00: definiendum | @#FFBB00: $e \in$ it |
| @#55EE55: postulate   | @#55EE55: $e*a=a*e=e$ |

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=== Reference ===
Wikipedia: [[http://en.wikipedia.org/wiki/Magma_%28algebra%29|Magma]]

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=== Requirements ===
[[Magma]]