Understanding The Computation Process
The following illustrates how the above PDA computes on different input strings. The subscript from the step symbol is here omitted.
(a) Input string = 0011. There are various computations, depending on the moment the move from state to state is made. Only one of these is accepting.
- (i) . The final state is accepting, but the input is not accepted this way as it has not been read.
- (ii) . No further steps possible.
- (iii) . Accepting computation: ends in accepting state, while complete input has been read.
(b) Input string = 00111. Again there are various computations. None of these is accepting.
- (i) . The final state is accepting, but the input is not accepted this way as it has not been read.
- (ii) . No further steps possible.
- (iii) . The final state is accepting, but the input is not accepted this way as it has not been (completely) read.
Read more about this topic: Pushdown Automaton
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