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Paper Abstract and Keywords
Presentation 2013-12-20 09:30
Reflections on a CFL decision problem "L(G)=Σ* ?"
Eiiichi Tanaka COMP2013-38
Abstract (in Japanese) (See Japanese page) 
(in English) The decision problem "whether a context free grammar G generates all terminal strings or not" has been considered to be undecidable. We prove that this decision problem is decidable. Therefore, the 2nd halting problem of a Turing machine, the decision problem of a semi-Thue system and Post's correspondence problem are decidable.
Keyword (in Japanese) (See Japanese page) 
(in English) Context Free Language / Decision Problem / Godel / Halting Problem / Turing Machine / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 371, COMP2013-38, pp. 1-6, Dec. 2013.
Paper # COMP2013-38 
Date of Issue 2013-12-13 (COMP) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee COMP  
Conference Date 2013-12-20 - 2013-12-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawa Industry Support Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To COMP 
Conference Code 2013-12-COMP 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Reflections on a CFL decision problem "L(G)=Σ* ?" 
Sub Title (in English)  
Keyword(1) Context Free Language  
Keyword(2) Decision Problem  
Keyword(3) Godel  
Keyword(4) Halting Problem  
Keyword(5) Turing Machine  
1st Author's Name Eiiichi Tanaka  
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Date Time 2013-12-20 09:30:00 
Presentation Time 25 minutes 
Registration for COMP 
Paper # COMP2013-38 
Volume (vol) vol.113 
Number (no) no.371 
Page pp.1-6 
Date of Issue 2013-12-13 (COMP) 

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