For questions 3 to 5, remember that a Turing machine starts in state 1, reading the leftmost nonblank cell.

1. Given the Turing machine instruction

(1,1,0,2,L)

and the configuration

... b 1 0 b ... (Tape read head is in state 1, and is over symbol 1 on the left)

Draw the next configuration.

2. A Turing machine contains only the following instructions:

(1,1,1,1,R)

(1,b,1,2,R)

Can this machine ever reach the following configuration? Explain your answer.

... b 0 1 b ... (Tape read head is in state 1, and is over symbol 1 on the left)

3. Find the output for the Turing machine

(1,1,1,2,R)

(1,0,0,2,R)

(1,b,1,2,R)

(2,0,0,2,R)

(2,1,0,1,R)

when run on the tape

... b 1 0 0 1 b ...

4. Find the output for the Turing machine

(1,1,1,2,L)

(2,b,0,3,L)

(3,b,1,4,R)

(4,0,1,4,R)

when run on the tape

... b 1 b ...

5. Describe the behavior of the Turing machine

(1,1,1,1,R)

(1,0,0,2,L)

(2,1,0,2,L)

(2,b,1,3,L)

(3,b,b,1,R)

when run on the tape

... b 1 0 1 b ...

1. Given the Turing machine instruction

(1,1,0,2,L)

and the configuration

... b 1 0 b ... (Tape read head is in state 1, and is over symbol 1 on the left)

Draw the next configuration.

2. A Turing machine contains only the following instructions:

(1,1,1,1,R)

(1,b,1,2,R)

Can this machine ever reach the following configuration? Explain your answer.

... b 0 1 b ... (Tape read head is in state 1, and is over symbol 1 on the left)

3. Find the output for the Turing machine

(1,1,1,2,R)

(1,0,0,2,R)

(1,b,1,2,R)

(2,0,0,2,R)

(2,1,0,1,R)

when run on the tape

... b 1 0 0 1 b ...

4. Find the output for the Turing machine

(1,1,1,2,L)

(2,b,0,3,L)

(3,b,1,4,R)

(4,0,1,4,R)

when run on the tape

... b 1 b ...

5. Describe the behavior of the Turing machine

(1,1,1,1,R)

(1,0,0,2,L)

(2,1,0,2,L)

(2,b,1,3,L)

(3,b,b,1,R)

when run on the tape

... b 1 0 1 b ...

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