Generate a CFG for the following expression: a*bambmc Where n>0, m>=0
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Generate a context free grammer for the expression, your final answer should be in a similar form to the red circled example.

Transcribed Image Text:**Title: Understanding Grammar for (a^n b^a)^*, Where n ≥ 2**
**Introduction:**
In formal language theory, we often explore grammars that generate particular patterns of strings. One such pattern is (a^n b^a)^*, where n is greater than or equal to 2. Let's explore the rules and an example of how such a grammar can be constructed.
**Grammar Rules:**
1. **S → null | SS | aTa**
- Start with S, where S can be replaced by nothing (null), two consecutive S's (SS), or a followed by T and another a (aTa).
2. **T → aUa**
- The non-terminal T can be further expanded into a followed by U and another a (aUa).
3. **U → aUa | b**
- U can be expanded into a followed by U and another a (aUa) or simply b.
**Example Derivation:**
We'll build a string using the production rules:
1. Start: **S → SS**
2. Apply S → SS: **S → SSS**
3. Apply S → aTa: **S → aTaSS**
4. Substitute aTa: **S → aTaaTaaTa**
5. Make substitutions:
- **T → aUa**
- **U → b**
After these substitutions, you arrive at the string:
- **aaUaaaaUaaaaUaa**
Finally, using the last rule:
- U's are replaced to form: **aabaaaabaaabaa**
The result is an example of a string that adheres to the grammar defined for (a^n b^a)^*, demonstrating the recursive structure and balance of a's and b's in the sequence.
**Conclusion:**
Through this example, we have constructed a string that matches the pattern specified by the grammar for (a^n b^a)^*. This illustrates how using a series of production rules can generate specific forms of strings in formal language theory.

Transcribed Image Text:**Title: Generating a CFG for a Given Expression**
**Objective:**
Learn to generate a Context-Free Grammar (CFG) for a specified expression.
**Expression:**
a* bⁿ aᵐ bᵐ cⁿ
*Where n > 0 and m ≥ 0.*
**Instructions:**
Generate a CFG that describes the expression where:
- \(a^*\) denotes zero or more occurrences of 'a'.
- \(b^n\) and \(c^n\) represent sequences where the number of 'b's and 'c's are equal and greater than zero.
- \(a^m b^m\) indicates sequences of 'a's and 'b's where the number of 'a's equals the number of 'b's and can be zero or more.
**Expectations:**
Create rules that capture the structure of the expression using CFG notation, ensuring to follow the conditions specified for \(n\) and \(m\).
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