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MIT 18.06 Linear Algebra, Spring 2010 13 Online
OpenStudy (anonymous):

what is a an abelian group?

OpenStudy (helder_edwin):

an abelian group is a group whose operation is commutative

OpenStudy (anonymous):

i dont get it??

OpenStudy (helder_edwin):

these is the commutative property of addition \[ \large a+b=b+a \] if u have a general operation, say *, then it would be \[ \large a*b=b*a \] when this holds in a group, the group is called abelian

OpenStudy (anonymous):

k.....i got it...then what is a group?

OpenStudy (helder_edwin):

a group is a set with an operation * which satisfies the following conditions: (i) given any \(a\) and \(b\) in the set, \(a*b\) has to bet in the set closure property (ii) \(a*(b*c)=(a*b)*c\) associative property (iii) there is an element \(e\) in the set such that \(e*a=a*e=a\) for every \(a\) neutral element (iv) for every \(a\) in the set there is another element \(a'\) in the set such that \(a*a'=a'*a=e\) inverse element

OpenStudy (anonymous):

itz make sense dear

OpenStudy (helder_edwin):

good

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