2. Consider the DFA defined by its transition graph as below. Given a DFA, we define the notion of a regular expression R) for the language L consisting of all strings that go from state q, to state q; without visiting a state numbered larger than k along the way (visiting the first and last state is not considered). (b) For the DFA given above, specify the following regular expressions. You do not need to justify your answer. (a) 440) (c) (d) (e) R12 F RO q2 R

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Chapter1: Introduction
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**DFA Transition Graph and Regular Expressions**

The diagram represents a Deterministic Finite Automaton (DFA) with four states, labeled \( q_1, q_2, q_3, \) and \( q_4 \). Each state is depicted as a circle. The transitions between the states are represented by arrows labeled with the input symbols:

- **State Transitions:**
  - \( q_1 \) transitions to:
    - \( q_2 \) on input \( a \)
    - \( q_3 \) on input \( c \)
    - \( q_4 \) on input \( b \)
  - \( q_2 \) transitions to itself on input \( a \).
  - \( q_3 \) transitions to:
    - \( q_1 \) on input \( a \)
    - \( q_3 \) on input \( c \)
    - \( q_4 \) on input \( b \)
  - \( q_4 \) transitions to:
    - \( q_3 \) on input \( c \)
    - \( q_4 \) on input \( b \)
    - \( q_1 \) on input \( a \)

Given a DFA, we define the notion of a regular expression \( R_{ij}^{(k)} \) for the language \( L_{ij}^{(k)} \) consisting of all strings that go from state \( q_i \) to state \( q_j \) without visiting a state numbered larger than \( k \) along the way (visiting the first and last state is not considered).

For the DFA given above, specify the following regular expressions. You do not need to justify your answer.

(a) \( R_{44}^{(0)} \)

(b) \( R_{12}^{(0)} \)

(c) \( R_{12}^{(4)} \)

(d) \( R_{11}^{(0)} \)

(e) \( R_{11}^{(4)} \)
Transcribed Image Text:**DFA Transition Graph and Regular Expressions** The diagram represents a Deterministic Finite Automaton (DFA) with four states, labeled \( q_1, q_2, q_3, \) and \( q_4 \). Each state is depicted as a circle. The transitions between the states are represented by arrows labeled with the input symbols: - **State Transitions:** - \( q_1 \) transitions to: - \( q_2 \) on input \( a \) - \( q_3 \) on input \( c \) - \( q_4 \) on input \( b \) - \( q_2 \) transitions to itself on input \( a \). - \( q_3 \) transitions to: - \( q_1 \) on input \( a \) - \( q_3 \) on input \( c \) - \( q_4 \) on input \( b \) - \( q_4 \) transitions to: - \( q_3 \) on input \( c \) - \( q_4 \) on input \( b \) - \( q_1 \) on input \( a \) Given a DFA, we define the notion of a regular expression \( R_{ij}^{(k)} \) for the language \( L_{ij}^{(k)} \) consisting of all strings that go from state \( q_i \) to state \( q_j \) without visiting a state numbered larger than \( k \) along the way (visiting the first and last state is not considered). For the DFA given above, specify the following regular expressions. You do not need to justify your answer. (a) \( R_{44}^{(0)} \) (b) \( R_{12}^{(0)} \) (c) \( R_{12}^{(4)} \) (d) \( R_{11}^{(0)} \) (e) \( R_{11}^{(4)} \)
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