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**Theory Of Automata By Dr. MM Alam**

Lecture # 6 Theory Of Automata By Dr. MM Alam

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**Lecture#5 Recap Introduction to Finite Automata**

Finite Automata representation using Transition tables and using graphs Finite Automata examples

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a a,b b 0 1

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**Given an input string, an FA will either accept or reject the input based on the following:**

If final state is reached after reading the string, the FA will accept the string If the final state is not reachable after reading the individual symbols of a string, then FA will reject the string.

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Construct a regular expression and correspondingly an FA for all words in which a appears tripled, if at all. The regular expression is as follows:- (aaa+b)* a, b a a a 1 - 2 3 5+ a,b b b b a,b 4+ 6

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Construct a regular expression and correspondingly an FA for all strings that end in a double letter. The regular expression is as follows:- (a+b)*(aa+bb) a a 2+ 1 - 1 a b b a b b a 4+ b 3+

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**L1 = The language of strings, defined over Σ={a, b}, beginning with b**

–– +

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**1 The language of strings, defined over Σ={a, b}, not beginning with a**

. a,b 1 b +2 a,b a 3

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**JLFAP provides a Hands-on Approach to Formal Languages and Automata. **

JLFAP = Java Formal Languages and Automata Package It is an Instructional tool to learn concepts of Formal Languages and Automata Theory Topics: Regular Languages (Finite Automata, Regular Expressions etc.,) Context-Free Languages and many more…

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**Lecture#6 Summary Finite Automata examples corrections**

JFLAP Introduction Practical Demonstration of JFLAP

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