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Lien 3:
* Dabinon <math> e \in G </math>, <math> e\cdot a=a\cdot e =a</math> pro alik <math> a \in G </math>. (dilet dientifik)
* Pro alik <math> a \in G </math>, dabinon <math> a^{-1} \in G </math>, <math> a\cdot a^{-1}=e </math>
==sams grupa==
[[Klad:Matemat]]
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