What state is missing from the state diagram? Explain the convention for entering this state with an example configuration in the state B whose next configuration enters this state. What about the state diagram let you know that the next state was this missing state?

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
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**Title: Understanding State Diagrams: Missing States and Configuration Examples**

**Text:**

What state is missing from the state diagram? Explain the convention for entering this state with an example configuration in the state \( B \) whose next configuration enters this state. What about the state diagram let you know that the next state was this missing state?

---

**Explanation:**

In this educational text, we are asked to identify and explain a missing state in a state diagram. This involves understanding the conventions used in state diagrams and how transitions occur between states.

1. **Identifying the Missing State:**
   - A state in a state diagram may be missing due to improper configuration or transitions.
   
2. **Convention for Entering the Missing State:**
   - Each state in a diagram follows certain rules or "conventions" for transitioning from one state to another. Understanding this can help identify how a certain state is reached.
   - For example, if we have a state labeled \( B \), we need to understand under what circumstances or configurations a transition from \( B \) occurs to reach the missing state.

3. **Example Configuration:**
   - Suppose in the state \( B \), we have configurations such as input values or conditions that define when a transition should occur. For instance, if a particular input set in \( B \) meets specific criteria, that will lead to the missing state.
   
4. **Understanding the State Diagram:**
   - The state diagram might show arrows or labels indicating transitions, which can hint towards the expected missing state. The absence of such an indicator or incomplete transitions may reveal the missing state.
  
Remember, a state diagram is a visual representation often used to depict the transitions between different states in a system. Identifying missing components or states is crucial for understanding and ensuring correct operation within the context the diagram is used.
Transcribed Image Text:**Title: Understanding State Diagrams: Missing States and Configuration Examples** **Text:** What state is missing from the state diagram? Explain the convention for entering this state with an example configuration in the state \( B \) whose next configuration enters this state. What about the state diagram let you know that the next state was this missing state? --- **Explanation:** In this educational text, we are asked to identify and explain a missing state in a state diagram. This involves understanding the conventions used in state diagrams and how transitions occur between states. 1. **Identifying the Missing State:** - A state in a state diagram may be missing due to improper configuration or transitions. 2. **Convention for Entering the Missing State:** - Each state in a diagram follows certain rules or "conventions" for transitioning from one state to another. Understanding this can help identify how a certain state is reached. - For example, if we have a state labeled \( B \), we need to understand under what circumstances or configurations a transition from \( B \) occurs to reach the missing state. 3. **Example Configuration:** - Suppose in the state \( B \), we have configurations such as input values or conditions that define when a transition should occur. For instance, if a particular input set in \( B \) meets specific criteria, that will lead to the missing state. 4. **Understanding the State Diagram:** - The state diagram might show arrows or labels indicating transitions, which can hint towards the expected missing state. The absence of such an indicator or incomplete transitions may reveal the missing state. Remember, a state diagram is a visual representation often used to depict the transitions between different states in a system. Identifying missing components or states is crucial for understanding and ensuring correct operation within the context the diagram is used.
The diagram represents a Turing machine, which consists of several states and transitions between them:

### States:
- **A**: Initial state
- **B**: Intermediate state
- **C**: Intermediate state
- **D**: Intermediate state
- **Accept**: Final accepting state

### Transitions:
- From **A**:
  - On reading `a`: replace with `ā`, move right, transition to **B**.
  - On reading `b`: move right, stay in **A**.
  - On reading `ā`: move right, transition back to **A**.
  
- From **B**:
  - On reading `a`: move right, stay in **B**.
  - On reading `b`: replace with `ḃ`, move left, transition to **C**.

- From **C**:
  - On reading `ḃ`: move left, stay in **C**.
  - On reading `a`: move left, stay in **C**.
  - On all other symbols: move left, stay in **C**.

- From **D**:
  - On reading `ḃ`: move right, stay in **D**.
  - On reading blank (`_`): move right, transition to **Accept**.

This Turing machine operates by making use of:
- States and transitions.
- Reading and writing using a tape.
- Moving left or right on the tape based on inputs.

The machine aims to transform and accept specific string patterns, provided it reaches the "Accept" state according to its defined rules.
Transcribed Image Text:The diagram represents a Turing machine, which consists of several states and transitions between them: ### States: - **A**: Initial state - **B**: Intermediate state - **C**: Intermediate state - **D**: Intermediate state - **Accept**: Final accepting state ### Transitions: - From **A**: - On reading `a`: replace with `ā`, move right, transition to **B**. - On reading `b`: move right, stay in **A**. - On reading `ā`: move right, transition back to **A**. - From **B**: - On reading `a`: move right, stay in **B**. - On reading `b`: replace with `ḃ`, move left, transition to **C**. - From **C**: - On reading `ḃ`: move left, stay in **C**. - On reading `a`: move left, stay in **C**. - On all other symbols: move left, stay in **C**. - From **D**: - On reading `ḃ`: move right, stay in **D**. - On reading blank (`_`): move right, transition to **Accept**. This Turing machine operates by making use of: - States and transitions. - Reading and writing using a tape. - Moving left or right on the tape based on inputs. The machine aims to transform and accept specific string patterns, provided it reaches the "Accept" state according to its defined rules.
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