Is F5 a subfield of F7? I can think of the
answer 'yes' because they have the same set op operations +⋅
and the answer 'no' because in F5:2⋅3=1 and in
F7:2⋅3=6.When I consider the finite field with four elements F4:
{0,1,ω,ω2=ω+1} as being F2×F2 how do I prove or know that in this field 1+1=0 like
in F2?
EDIT: by F2×F2 I mean that the product may be defined in a complicated way, e.g. (a,b)⋅(c,d)=(ac+bd,ad+bc+bd). Unfortunately I don't know the correct notation.Can it be proved also for the field with 8 elements F8=F2×F2×F2?
Is it possible to enumerate the elements of F8 like an
extension of the elements of F4:
{0,1,ω,ω2=ω+1,γ,γ2,…,δ,…}
Sunday, 7 February 2016
Four questions about finite fields
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