I have about 5 questions all of a similar form .....(adsbygoogle = window.adsbygoogle || []).push({});

[tex] \mathbb{F}[C_2] \cong \mathbb{F} \times \mahbb{F} [/tex]

if 1+1 [tex] \neq 0 in \mathbb{F} [/tex]

[tex]\Re [C_3] \cong \Re \times C [/tex]

[tex] \Re [C_4] \cong \Re \times \Re \times C [/tex]

these were on the first sheet given out and I still don't know how to do them after 4 weeks, any help on how to do them??

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# Group rings

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