Which of the following statements aboutlanguages are true?Select one or more:The strings of a language with E ={a,b,c} are {a,b,c}*%3DThe language of a problem is chosenfrom the codomain by an indicatorfunctionDecidable means "co-recognizableAND recognizable"Rejected values form a co-recognizable languageV The language specified by { a | a=1and a=0 } is unrecognizable.If an indicator function always halts,then the language cannot bedecidableIf an indicator function might notterminate, then the language couldbe recognizableThe language specified by { a,b,c |a2+b²=c² } is unrecognizableIf an indicator function might nothalt, then the language isundecidable

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Which of the following statements about languages are true?

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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Concept explainers

Linux

An operating system (OS) is the software which manages hardware and resources, like CPU, storage and memory. The OS bridges the applications and hardware and makes the connections between all of your software and the hardware resources.

Question

Which of the following statements about
languages are true?
Select one or more:
The strings of a language with E =
{a,b,c} are {a,b,c}*
%3D
The language of a problem is chosen
from the codomain by an indicator
function
Decidable means "co-recognizable
AND recognizable"
Rejected values form a co-
recognizable language
V The language specified by { a | a=1
and a=0 } is unrecognizable.
If an indicator function always halts,
then the language cannot be
decidable
If an indicator function might not
terminate, then the language could
be recognizable
The language specified by { a,b,c |
a2+b²=c² } is unrecognizable
If an indicator function might not
halt, then the language is
undecidable

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