Practice Non-closure Of Turing Recognizable Languages Under Complement (9)
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Non-Closure of Turing Recognizable Languages under Complement

Practice - Non-Closure of Turing Recognizable Languages under Complement

Learning

Practice Questions

Test your understanding with targeted questions

Question 1 Easy

Define Turing recognizable language.

💡 Hint: Think about what the Turing machine does with strings not in the language.

Question 2 Easy

What is a decidable language?

💡 Hint: Consider the behavior of Turing machines in terms of halting.

4 more questions available

Interactive Quizzes

Quick quizzes to reinforce your learning

Question 1

What is a Turing recognizable language?

A language that a TM can accept and halts for all inputs.
A language that a TM may loop for non-members.
A language that always rejects all inputs.

💡 Hint: Consider how Turing machines behave with valid vs. invalid inputs.

Question 2

Is the complement of a Turing recognizable language also Turing recognizable?

True
False

💡 Hint: Recall the implications of decidability and recognizability.

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Challenge Problems

Push your limits with advanced challenges

Challenge 1 Hard

Given a Turing recognizable language L, provide an example of a string not in L and discuss its possible outcomes.

💡 Hint: Reflect on why incorrect syntax affects recognition.

Challenge 2 Hard

Prove that if a language is Turing recognizable, its complement is not necessarily recognizable by constructing an example.

💡 Hint: Utilize properties of the Halting Problem to illustrate non-closure.

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Reference links

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