Subgroups (AQA A-Level Further Maths): Quizzes

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Subgroups
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What is a subgroup of a group GG?

A subset that forms a group under GG's op

What does the trivial subgroup consist of?

Just the identity element alone

What is a proper subgroup?

Any subgroup that is not the entire group

Which are the four conditions for verifying subgroups (NICE)?

Non-empty, Identity, Closure, Inverses

How many conditions must fail to show HH is not a subgroup?

Just one condition is sufficient

What does Lagrange's Theorem state?

Order of every subgroup divides order of GG

A group has order 12. Which cannot be a subgroup order?

5

Must all subgroups contain the identity element of GG?

Yes, it's required by definition

For a 2-element subgroup, what property must the non-identity element have?

It must be self-inverse

What does closure mean for a subset HH?

If a,bHa, b \in H then abHa * b \in H

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