Individual #group_theory__grouptheory  the branch of mathematics dealing with groups
  >part:  Galois_theory  group theory applied to the solution of algebraic equations
  >part of:  pure_mathematics  the branches of mathematics that study and develop the principles of mathematics for their own sake rather than for their immediate usefulness
     >part of:  mathematics__math__maths__math  a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement

No statement uses or specializes group_theory; click here to add one.