Question: What Is The Difference Between A Tautology And A Self Contradiction?

What is a self contradiction in logic?

Self-contradiction (self contradictory statement) a statement which is necessarily false on the basis of its logical structure.

One can also say that a statement is necessarily true if its denial is logically self contradictory, i.e.

necessarily false..

What is an example of a tautology?

In grammatical terms, a tautology is when you use different words to repeat the same idea. For example, the phrase, “It was adequate enough,” is a tautology. The words adequate and enough are two words that convey the same meaning. … In other words, the sentence is always true since it includes both possibilities.

What is contradiction in truth table?

You can think of a tautology as a rule of logic. The opposite of a tautology is a contradiction, a formula which is “always false”. In other words, a contradiction is false for every assignment of truth values to its simple components.

Which of the following is the best example of a tautology?

In the realm of logic, a tautology is something that is true in all circumstances. A common example of a logical tautology is the following: The dog is either brown, or the dog is not brown.

What is the opposite of a tautology?

tautology. Antonyms: conciseness, brevity, laconism, compression. Synonyms: verbosity, redundancy, needless, repetition, pleonasm, reiteration.

How do you determine if a statement is a tautology?

A tautology is a statement that is always true, no matter what. If you construct a truth table for a statement and all of the column values for the statement are true (T), then the statement is a tautology because it’s always true!

What does it mean when someone says you contradict yourself?

: to say or do something that is opposite or very different in meaning to something else that one said or did earlier The witness contradicted herself when she insisted she could identify the thief even though she had said that the night was too foggy to see clearly.

How a statement is called contingent?

A contingent statement is a statement form which is neither a tautology, nor unsatisfiable, but whose truth value depends upon the truth value of its component substatements.

What is wrong with tautology?

The standard criticism of tautologies goes like this: because of the the fact that tautologies are necessarily true, they do not tell us anything new about the world. They cannot possibly be wrong; therefore, they do not add to our knowledge. They are redundancies, and they ultimately do not need to be stated.

Is period of time a tautology?

Tautology is: It is important to understand that a period of time can be any length, and your premise that ‘a period of time’ repeats the meaning of extensive is incorrect. This also holds for ‘extensive amounts of time’, since amounts of time holds no indication as to the duration.

Is tautology a fallacy?

A tautology in math (and logic) is a compound statement (premise and conclusion) that always produces truth. No matter what the individual parts are, the result is a true statement; a tautology is always true. The opposite of a tautology is a contradiction or a fallacy, which is “always false”.

What is a tautology statement?

A tautology is a logical statement in which the conclusion is equivalent to the premise. More colloquially, it is formula in propositional calculus which is always true (Simpson 1992, p. 2015; D’Angelo and West 2000, p.