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
What Is a Collection The collection is an ordered group of elements, all of similar type (for e.g. the grades for a class of students). Each element has a unique subscript whic

Anatomy of a Table: Figure shows the terminology used in SQL to refer to parts of the structure of a table. As you can see, SQL has no official terms for its counterpa

Character Types The Character types allow you to store alphanumeric data, represent words and text, and manipulate the character strings. CHAR You use the CHAR dataty

Updating a Variable Assignment of an attribute value in a variable of a structured type Synatx: SET SN.C = 'S2'; As in Example the entire statement is equivalent to a

Parameter and Keyword Description: label_name: This is an undeclared identifier which optionally labels a loop. When used, the label_name should be enclosed by double ang

Parameter Modes: You do not require to specify a parameter mode for the input bind arguments (those used, for illustration, in the WHERE clause) as the mode defaults to IN. Th

Authorize and fetch data from Instagram Project Description: Incorporate Instagram feed on mobile site platform: c#, ms sql, jquerymobile, jquery Web admin Author

Create a view named CustomerAddresses that shows the shipping and billing addresses for each customer in the MyGuitarShop database. This view should return these columns from the

Keyword & Parameter Description: WHEN: This keyword introduces the exception handler. You can have many exceptions execute the similar sequence of the statements by follo

Declaring a Cursor The Forward references are not allowed in the PL/SQL. Therefore, you must declare a cursor before referencing it in other statements. Whenever you declare a