Question

design a turing machine for l={wcw | w € (a,b)*}​

Answer 1

Answer:

Construct a Turing Machine for language L = {ww | w ∈ {0,1}}

Prerequisite – Turing Machine

The language L = {ww | w ∈ {0, 1}} tells that every string of 0’s and 1’s which is followed by itself falls under this language. The logic for solving this problem can be divided into 2 parts:

Finding the mid point of the string

After we have found the mid point we match the symbols

Example – Lets understand it with the help of an example. Lets string 1 0 1 1 0 1, so w = 1 0 1 and string is of form (ww).

The first thing that we do is to find the midpoint. For this, we convert 1 in the beginning into Y and move right till the end of the string. Here we convert 1 into y.

Now our string would look like Y 0 1 1 0 Y. Now move left till, find a X or Y. When we do so, convert the 0 or 1 right of it to X or Y respectively and then do the same on the right end. Now our string would look like Y X 1 1 X Y. Thereafter, convert these 1’s also and finally it would look like Y X Y Y X Y.

At this point, you have achieved the first objective which was to find the midpoint. Now convert all X and Y on the left of midpoint into 0 and 1 respectively, so string becomes 1 0 1 Y X Y. Now, convert the 1 into Y and move right till, find Y in the beginning of the right part of the string and convert this Y into a blank (denoted by B). Now string looks like Y 0 1 B X Y.

Similarly, apply this on 0 and x followed by 1 and Y. After this string looks like Y X Y B B B. Now that you have no 0 and 1 and all X and Y on the right part of the string are converted into blanks so our string will be accepted.

Explanation:

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