How do we know that there are unreachable positions on a Rubik's cube?
How do we know what they are?
I'm interested in a proof or proof sketch that:
(i) there are positions on a Rubik's Cube that cannot be reached by legal moves.
(ii) there is no sequence of moves that will swap a single pair of pieces or rotate a single corner or edge ect.
How do we know what they are?
I'm interested in a proof or proof sketch that:
(i) there are positions on a Rubik's Cube that cannot be reached by legal moves.
(ii) there is no sequence of moves that will swap a single pair of pieces or rotate a single corner or edge ect.