Group Theory (AQA A-Level Further Maths): Quizzes

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Isomorphisms
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Why are isomorphisms useful in group theory?

Results for one group apply to isomorphic groups

What type of mapping is an isomorphism between groups?

One-to-one mapping preserving group structure

If f(p)=af(p) = a and f(q)=bf(q) = b, what must hold for ff to be an isomorphism?

f(pq)=f(p)f(q)f(p \bullet q) = f(p) \star f(q)

What does the notation HGH \cong G indicate?

Groups HH and GG are isomorphic

What is a self-inverse element aa in a group?

An element where aa=ea \bullet a = e

What is the first step in the five-step strategy to prove isomorphism?

Identify the identity element in each group

How many methods are needed to prove two groups are NOT isomorphic?

Only ONE structural difference

What is the period of an element aa in a group?

Smallest positive nn where an=ea^n = e

Which difference proves groups are NOT isomorphic?

One group is cyclic, the other is not

Must identity elements correspond in isomorphic groups?

Yes, identity elements must correspond

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