Difference between revisions of "Grammar: Decidable and Undecidable Problems"

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! <math>L(G_1) \cap L(G_2) = \phi</math>
 
! <math>L(G_1) \cap L(G_2) = \phi</math>
 
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|-
−
|Regular
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|Regular Grammar
−
| {{Yes}}
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| {{D}}
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| {{Yes}}
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| {{D}}
−
| {{Yes}}
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| {{D}}
−
| {{Yes}}
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| {{D}}
−
| {{Yes}}
+
| {{D}}
−
| {{Yes}}
+
| {{D}}
 
|-
 
|-
−
|DCFG
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|Det. Context Free
−
| {{Yes}}
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| {{D}}
−
| {{Yes}}
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| {{D}}
−
| {{No}}
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| {{UD}}
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| {{No}}
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| {{UD}}
 
| {{?}}
 
| {{?}}
−
| {{No}}
+
| {{UD}}
 
|-
 
|-
−
|Complement
+
|Context Free
−
| {{Yes}}
+
| {{D}}
−
| {{Yes}}
+
| {{D}}
−
| {{No}}
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| {{UD}}
−
| {{Yes}}
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| {{UD}}
−
| {{Yes}}
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| {{UD}}
−
| {{No}}
+
| {{UD}}
 
|-
 
|-
−
|Concatenation
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|Context Sensitive
−
| {{Yes}}
+
| {{D}}
−
| {{No}}
+
| {{UD}}
−
| {{Yes}}
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| {{UD}}
−
| {{Yes}}
+
| {{UD}}
−
| {{Yes}}
+
| {{UD}}
−
| {{Yes}}
+
| {{UD}}
 
|-
 
|-
−
|Kleene star
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|Recursive
−
| {{Yes}}
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| {{D}}
−
| {{No}}
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| {{UD}}
−
| {{Yes}}
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| {{UD}}
−
| {{Yes}}
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| {{UD}}
−
| {{Yes}}
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| {{UD}}
−
| {{Yes}}
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| {{UD}}
−
|-
 
−
|Homomorphism
 
−
| {{Yes}}
 
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| {{No}}
 
−
| {{Yes}}
 
−
| {{No}}
 
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| {{No}}
 
−
| {{Yes}}
 
−
|-
 
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|<math>\epsilon</math>-free Homomorphism
 
−
| {{Yes}}
 
−
| {{No}}
 
−
| {{Yes}}
 
−
| {{Yes}}
 
−
| {{Yes}}
 
−
| {{Yes}}
 
−
|-
 
−
|Substitution (<math>\epsilon</math>-free)
 
−
| {{Yes}}
 
−
| {{No}}
 
−
| {{Yes}}
 
−
| {{Yes}}
 
−
| {{No}}
 
−
| {{Yes}}
 
−
|-
 
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|Inverse Homomorphism
 
−
| {{Yes}}
 
−
| {{Yes}}
 
−
| {{Yes}}
 
−
| {{Yes}}
 
−
| {{Yes}}
 
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| {{Yes}}
 
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|-
 
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|Reverse
 
−
| {{Yes}}
 
−
| {{No}}
 
−
| {{Yes}}
 
−
| {{Yes}}
 
−
| {{Yes}}
 
−
| {{Yes}}
 
 
|-
 
|-
 +
|Recursively Enumerable
 +
| {{D}}
 +
| {{UD}}
 +
| {{UD}}
 +
| {{UD}}
 +
| {{UD}}
 +
| {{UD}}
 +
 
|}
 
|}

Revision as of 18:06, 26 February 2014

Grammar: Decidable and Undecidable Problems
Grammar <math>w \in L(G)</math> <math>L(G) = \phi</math> <math>L(G) = \Sigma^*</math> <math>L(G_1) \subseteq L(G_2)</math> <math>L(G_1) = L(G_2)</math> <math>L(G_1) \cap L(G_2) = \phi</math>
Regular Grammar D D D D D D
Det. Context Free D D UD UD ? UD
Context Free D D UD UD UD UD
Context Sensitive D UD UD UD UD UD
Recursive D UD UD UD UD UD
Recursively Enumerable D UD UD UD UD UD
Retrieved from "https://gatecse.in/w/index.php?title=Grammar:_Decidable_and_Undecidable_Problems&oldid=2644"
Grammar: Decidable and Undecidable Problems
Grammar <math>w \in L(G)</math> <math>L(G) = \phi</math> <math>L(G) = \Sigma^*</math> <math>L(G_1) \subseteq L(G_2)</math> <math>L(G_1) = L(G_2)</math> <math>L(G_1) \cap L(G_2) = \phi</math>
Regular Grammar D D D D D D
Det. Context Free D D UD UD ? UD
Context Free D D UD UD UD UD
Context Sensitive D UD UD UD UD UD
Recursive D UD UD UD UD UD
Recursively Enumerable D UD UD UD UD UD