效绵 Picture of a Turing Machine Action:based on the state and the tape symbol under the head:change state,rewrite the symbol and move the State head one square. A B C A D Infinite tape with squares containing tape symbols chosen from a finite alphabet 3Picture of a Turing Machine 3 State . . . A B C A D . . . Infinite tape with squares containing tape symbols chosen from a finite alphabet Action: based on the state and the tape symbol under the head: change state, rewrite the symbol and move the head one square