Proposition Let H be a subgroup of G with g \in G and define a map \phi:H \rightarrow gH by \phi(h) = gh. The map \phi is bijective; hence, the number of elements in H is the same as the number of elements in gH.
Lagrange's Theorem
suggests that groups of prime order \(p\) must somehow look like \({\mathbb Z}_p\).
In fact, we can say more about when two cycles have the same length.
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What is a group, in plain words?
A set with one operation that is associative, has an identity, and lets every element be undone. Symmetries of any object form a group. That is where the idea came from.
What is the difference between a ring and a field?
A ring has addition and multiplication that behave like the integers (you cannot always divide); a field is a ring where every non-zero element has a reciprocal, like the rationals or the reals.