operator p, Theory of Computation

implementation of operator precedence grammer
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Exercise:  Give a construction that converts a strictly 2-local automaton for a language L into one that recognizes the language L r . Justify the correctness of your construction.

Find a regular expression for the regular language L={w | w is decimal notation for an integer that is a multiple of 4}


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We saw earlier that LT is not closed under concatenation. If we think in terms of the LT graphs, recognizing the concatenation of LT languages would seem to require knowing, while

(c) Can you say that B is decidable? (d) If you somehow know that A is decidable, what can you say about B?

Suppose G = (N, Σ, P, S) is a reduced grammar (we can certainly reduce G if we haven't already). Our algorithm is as follows: 1. Define maxrhs(G) to be the maximum length of the

Find the Regular Grammar for the following Regular Expression:                    a(a+b)*(ab*+ba*)b.

While the SL 2 languages include some surprisingly complex languages, the strictly 2-local automata are, nevertheless, quite limited. In a strong sense, they are almost memoryless

The Equivalence Problem is the question of whether two languages are equal (in the sense of being the same set of strings). An instance is a pair of ?nite speci?cations of regular