Answer to Question #81443 in Abstract Algebra for Amalabi

Question

Which of the following statements are true? Give reasons for your answers. Marks will
only be given for valid reasons.
i) If σ is an even permutation, then I
2 σ = .
ii) If G is a group such that m (o G) = 2 , where m∈N , then G has a subgroup of order
m.
iii) If G is of order 25, then = < x >
α
x generates G , where α is a factor of 25.
iv) { , , , } α1 α2 K αn
is a set only if all the s αi
follow a given rule.
v) The characteristic of a field containing )1 50( − elements is 50.
vi) Every subring of a non-commutative ring is non-commutative.
vii) If ) ( ,R ,
1 2
∗ ∗ is a ring, then 1 2 1 2 1 ψ : R × R → R :ψ(r r, ) = r ∗ r is a binary operation.
viii) Not every polynomial that is irreducible over ]x[ Q is irreducible over ]x[ Z .
ix) If .), ( ,D + is an integral domain such that 1∈D , then D is a field.
x) The function f , defined by
3 x
x 1
)x(f
−
−
= , has the same set as domain and as
range.

Answer 1

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