"समूह (गणितशास्त्र)": अवतरणों में अंतर

|source={{harvs|txt=yes|authorlink=Richard Borcherds|first=Richard|last=Borcherds|year=2009|loc=Mathematicians, quoted in [[James Milne (mathematician)|Milne]], group theory [http://www.jmilne.org/math/CourseNotes/gt.html]}}}}-->

 

;बंद: ∀ a, b ∈ G ⇒ a*b ∈ G

;साहचर्य : ∀ a, b, c ∈ G ⇒ a*(b*c) = (a*b)*c