Linked from
The 16 pages that link to Orbit-stabilizer theorem, each with the reason it gives.
Group actionRelated: It connects the two basic measurements produced by an action.
Group theoryRelated: It connects how a group moves objects to the subgroup that fixes them.
Finite groupRelated: It converts symmetry into a counting equation for finite groups.
CosetRelated: The orbit can be identified with cosets of the point stabilizer.
Conjugacy classRelated: It gives the class-size formula from the centralizer's index.
Sylow theoremsRelated: Applied to conjugation, it converts the number of conjugates into an index.
Burnside's lemmaRelated: It supplies a complementary way to relate orbit sizes and stabilizers.
CentralizerRelated: Conjugation turns the centralizer into the stabilizer in this counting formula.