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Suppose A = (Σ, T) is an SL2 automaton. Sketch an algorithm for recognizing L(A) by, in essence, implementing the automaton. Your algorithm should work with the particular automaton being given as a table of some sort, so that it can be easily generalized for the next part of the exercise. Your algorithm may halt as soon as it detects that the input is not in the language.
Define the following concept with an example: a. Ambiguity in CFG b. Push-Down Automata c. Turing Machine
First model: Computer has a ?xed number of bits of storage. You will model this by limiting your program to a single ?xed-precision unsigned integer variable, e.g., a single one-by
phases of operational reaserch
We'll close our consideration of regular languages by looking at whether (certain) problems about regular languages are algorithmically decidable.
Can you say that B is decidable? If you somehow know that A is decidable, what can you say about B?
When we study computability we are studying problems in an abstract sense. For example, addition is the problem of, having been given two numbers, returning a third number that is
a finite automata accepting strings over {a,b} ending in abbbba
Given any NFA A, we will construct a regular expression denoting L(A) by means of an expression graph, a generalization of NFA transition graphs in which the edges are labeled with
what exactly is this and how is it implemented and how to prove its correctness, completeness...
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
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