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An Bunachar Náisiúnta Téarmaíochta don Ghaeilge
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GAball fir1 céannachta de ghrúpa
gu baill chéannachta de ghrúpa
Matamaitic » Céimseata » Céimseata Chomhordanáideach Is ann do bhall uathúil e de ghrúpa G a bhfuil an airí seo a leanas aige: do gach a in G: a * e = e * a = a Tugtar an ball céannachta ar an mball e.
Mathematics » Geometry » Coordinate Geometry There exists a unique element e of a group G having the property that for every a in G: a * e = e * a = a The element e is called the identity element.