Using the definition 4.1 and 4.3 of a group G1,G2 and G3 axioms to show that: a. Z is a group under addition  b. Q* of nonzero numbers under multiplication is abelian group. c. 2Z = {2n|n e Z} by letting a * b = a +b. (4.3   A group G is abelian if it's binary operation is commutative.)

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Chapter2: Second-order Linear Odes
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Using the definition 4.1 and 4.3 of a group G1,G2 and G3 axioms to show that:

a. Z is a group under addition

 b. Q* of nonzero numbers under multiplication is abelian group.

c. 2Z = {2n|n e Z} by letting a * b = a +b.

(4.3   A group G is abelian if it's binary operation is commutative.)

 

4.1 Definition A group (G, *) is a set G, closed under a binary operation, such that the following
axioms are satisfied:
G: For all a, b, c € G, we have
(a*b) * c = a* (b*c). associativity of *
=
Part I Groups and Subgroups
2: There is an element e in G such that for all x € G,
e*x=x*e=x. identity element e for *
: Corresponding to each a € G, there is an element a' in G such that
a* a' = a' *a = e. inverse a' of a
Transcribed Image Text:4.1 Definition A group (G, *) is a set G, closed under a binary operation, such that the following axioms are satisfied: G: For all a, b, c € G, we have (a*b) * c = a* (b*c). associativity of * = Part I Groups and Subgroups 2: There is an element e in G such that for all x € G, e*x=x*e=x. identity element e for * : Corresponding to each a € G, there is an element a' in G such that a* a' = a' *a = e. inverse a' of a
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