Math and science::Algebra::Aluffi
Groups. Lagrange's theorem.
Lagrange's theorem
Let
There are three corollaries on the reverse. Can you remember them?
- About the order of
in . - When
is a prime. - Fermat's little theorem.
divides
For any element
As a result,
When is a prime
If
Fermat's little theorem
Let
Note on Fermat's little theorem
If one expects to see