Let S={0,1,2,3,...,9,-,=} and SUB = {x-y=z | x,y,z are unsigned integers, and z is the difference of x and y}. For example, string “99-21=78” is in SUB, while string “99-21=77” is not in SUB. using pumping lamma to prove that SUB is not a regular language.

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Let S={0,1,2,3,...,9,-,=} and
SUB = {x-y=z | x,y,z are unsigned integers, and z is the difference of x and y}.
For example, string “99-21=78” is in SUB, while string “99-21=77” is not in SUB.
using pumping lamma to prove that SUB is not a regular language.

 

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