Eight-stage process - conjunctive normal forms, Computer Engineering

Assignment Help:

Eight-stage process - Conjunctive normal forms:

Hence we notice the following eight-stage process converts any sentence with CNF as: 

1.  Eliminate all arrow connectives by rewriting into 

      P ↔ Q    =>   (P  →Q) ^  (Q → P)

      P → Q   =>   ¬P ? Q

2.  Just move ¬ inwards requiring De Morgan's laws in inc. quantifier versions and double

3.  Here rename variables apart: as the same variable name may be reused several times for different variables, contained by one sentence or between several. However to avoid confusion later rename each distinct variable into a unique name. 

4. Now move quantifiers outwards: as the sentence is now in a form whether all the quantifiers can be moved safely to the outside else affecting the semantics, which are provided they are kept in the same order. 

5. Skolemise existential variables  by replacing them into  Skolem constants and functions. But this is similar to the existential elimination rule from the last lecture: as we just substitute a term for each existential variable such are represents the 'something' for that it holds. Suppose if there are no preceeding universal quantifiers the 'something' is a fresh constant. Moreover, if there are then we use a function that takes all these preceeding universal variables as arguments then we're done we just drop all the universal quantifiers. Thus this types  leaves a quantifier-free sentence.


Related Discussions:- Eight-stage process - conjunctive normal forms

Gather some ram data after system was powered off, (a) When a forensic exa...

(a) When a forensic examiner arrives at a crime scene, the first task done is referred to as "Incident Response". Summarize the different incident response tasks done in 10 steps.

EME, How can i made Carnot engine

How can i made Carnot engine

Level of any node of a tree, Level of any node of a tree is :- Its distanc...

Level of any node of a tree is :- Its distance from the root

Explain how does cpu perform read and write operation, Q. Explain how does...

Q. Explain how does CPU perform Read and Write operation on peripheral device taking suitable example in case of Synchronous Technique.

C, "Super ASCII", if it contains the character frequency equal to their asc...

"Super ASCII", if it contains the character frequency equal to their ascii values. String will contain only lower case alphabets (''a''-''z'') and the ascii values will starts from

Determine the order in which optimized c-scan would service, Consider the s...

Consider the situation in which the disk read/write head is currently located at track 45 (of tracks 0-255) and moving in the positive direction. Assume that the following track re

Why is xml superior to other forms of data exchange, Why is XML superior to...

Why is XML superior to other forms of data exchange? The XML gives universal data format for integrated electronic business solutions. Other database systems and Relational dat

How to copy files from a drive and directory, Q. How to copy files from a d...

Q. How to copy files from a drive and directory? You can copy files from a drive and directory other that the currently selected one. However in that case, you need to speci

What is directory, What is Directory?   The device directory or simply ...

What is Directory?   The device directory or simply called as directory records information-such as name, location, size, and type for all files on that certain partition. The

Characters in vi editor, What is the command used to replace many character...

What is the command used to replace many characters in Vi Editor? Ans) For replace most of the character in vi editor press esc key and then press R for change many character.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd