Tautologies, PL-SQL Programming

Tautologies:

Above given table allows us to read the truth of the connectives in the next manner. Just expect we are looking at row three. It means this says that, if there P is false and Q is true, so 

1843_tautologies.png

Specified there that, if P is false, so regardless of where Q is true or false, and the statement P→Q is true. Thus this takes a little getting needed to, to be a very important tool in theorem proving: if there we know that there is something false, than it can imply anything we want it to! Just,, the follow next sentence is true: like "Barack Obama is female" it really implies that "Barack Obama is an alien", it means it the premise that Barack Obama is female was false, now the conclusion is Barack Obama is an alien can be deduced in a sound way. 

Each of row in a truth table describe the connectives are a particular assignment of true and false to the individual propositions in a sentence. So than we identify each assignment a model like: whenever it represents a particular possible state of the world. So, just for two propositions P and Q there are four models. 

Hence, for propositional sentences in generally, there a model is also just a particular assignment of truth values to its individual propositions. If there a sentence with n propositions will have 2n possible models than 2n rows in its truth table. But a sentence S will be true or may false for a given model M - where S is true we say 'M is a model of S'. 

Such type of sentences that are always true, regardless of the truth of the individual propositions are known as tautologies or can say valid sentences. There Tautologies are true for all models. Just like for instance, if I said that the "Tony Blair is prime minister or can say like Tony Blair is not prime minister" so there this is largely a content-free sentence it means that we could have replaced the predicate of being Tony Blair with any predicate so the sentence would still have been correct.

Posted Date: 1/11/2013 5:28:12 AM | Location : United States







Related Discussions:- Tautologies, Assignment Help, Ask Question on Tautologies, Get Answer, Expert's Help, Tautologies Discussions

Write discussion on Tautologies
Your posts are moderated
Related Questions
Biconditional - SQL The biconditional p ↔ q can be expressed in Tutorial D by p = q and the same is true of SQL. The question then arises as to whether, in SQL, p = q is equiv

Project Description: We organize an online system called ACPAS we have created a project called EVO that can be use by our customers to integrate their web sites with the Acpas

%FOUND Subsequent to a cursor or cursor variable is opened but before the first fetch, the %FOUND yields NULL. Afterward, it yields TRUE when the last fetch returned a row, or

DELETE Statement The DELETE statement eliminates whole rows of data from the specified table or view. Syntax:

Create the four tables and populate them with the given data. Answer the following queries in SQL. 1. Get all part-color/part-city combinations. Note: Here and subsequently, the

Example of Shorthand for a row constraint Example: Shorthand for a row constraint ALTER TABLE EXAM_MARK ADD CONSTRAINT Mark_in_range CHECK (Mark BETWEEN 0 AND 100);

Name Resolution In potentially uncertain SQL statements, the names of the database columns take precedence over the names of the local variables and formal parameters. For e.g.

Closing a Cursor Variable The CLOSE statement disables the cursor variable. After that, the related result set is undefined. The syntax for the same is as shown below: CLOS

Committing and Rolling Back The COMMIT and ROLLBACK end the active autonomous transaction but do not exit the autonomous routine. As the figure shows, if one transaction ends,

I need SQL to infopath data connection Project Description: Want data retrieval connection from SQL to SharePoint infopath Skills required are Sharepoint, SQL