Sunday, 7 February 2016

Four questions about finite fields


  1. 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 F5:23=1 and in
    F7:23=6.


  2. 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.


  3. Can it be proved also for the field with 8 elements F8=F2×F2×F2?


  4. 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,}


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