Extra Pure Flashcards
1
Q
How to spot an abelian group from its Cayley table?
A
Symmetric about leading diagonal
2
Q
Inverse of
(a b)
(c d)
A
1/detA
(d -b)
(-c a)
3
Q
What do you have to remember to do when identifying the identity of a group?
A
Explicitly state “…and ___ is in the group”