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decidability doubt
sushmita
asked
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Theory of Computation
Dec 23, 2016
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Jul 4, 2017
by
Arjun
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While applying decidability theorem, can we only apply this theorem to undecidable problems or can we also apply them to recursively enumerable ie semidecidablle problems??
decidability
theory-of-computation
recursive-and-recursively-enumerable-languages
turing-machine
sushmita
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Theory of Computation
Dec 23, 2016
retagged
Jul 4, 2017
by
Arjun
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sushmita
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Lucky sunda
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Jan 20, 2017
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What is decidability theorem??
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ajaysoni1924
asked
in
Theory of Computation
Jul 15, 2019
847
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Self Doubt: Decidability
$L=\left \{\langle M_{1},M_{2}\rangle \text{ such that L}(M_{1})\prec L(M_{2}) \right \}$ is it recursive enumerable? here $L\left ( M_{1} \right )\prec L\left ( M_{2} \right )$ signifies language $L\left ( M_{1} \right )$ is reducible to $L\left ( M_{2} \right )$
ajaysoni1924
asked
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Theory of Computation
Jul 15, 2019
by
ajaysoni1924
847
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theory-of-computation
turing-machine
decidability
recursive-and-recursively-enumerable-languages
0
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0
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0
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2
Mk Utkarsh
asked
in
Theory of Computation
Nov 23, 2018
419
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Decidability Doubt
$L_1 = \{ \text{<M>} | \ \text{M is a TM, } \text{M}_0 \ \text{is a TM that halts on all inputs and, } \text{M}_0 \in L(M) \}$ ... because $\exists$ infinite number of TM's which accept $\Sigma^*$. Now $L(M)$ is not even RE. If that then how $L_1$ is RE. Please explain both.
Mk Utkarsh
asked
in
Theory of Computation
Nov 23, 2018
by
Mk Utkarsh
419
views
theory-of-computation
decidability
recursive-and-recursively-enumerable-languages
turing-machine
0
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0
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0
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3
aditi19
asked
in
Theory of Computation
Oct 29, 2018
254
views
Decidability Doubt
A recursive language is empty or a recursive language contains all strings over sigma*. Why this problem is undecidable?
aditi19
asked
in
Theory of Computation
Oct 29, 2018
by
aditi19
254
views
decidability
theory-of-computation
turing-machine
recursive-and-recursively-enumerable-languages
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4
rahul sharma 5
asked
in
Theory of Computation
Jan 15, 2017
759
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Doubt in GateCse Decidability Blog
In the deciadability chart mentioned on http://gatecse.in/grammar-decidable-and-undecidable-problems/ The undecidable problems mentioned here are semidecidable(RE but not REC) not NOT RE.Or there is no such relation? Can someone have a look and tell please?
rahul sharma 5
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Theory of Computation
Jan 15, 2017
by
rahul sharma 5
759
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decidability
theory-of-computation
recursive-and-recursively-enumerable-languages
turing-machine
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