# What Is Tautology And Contradiction?

## What is the main difference between tautology and contradiction?

A tautology is a statement that is true in virtue of its form.

Thus, we don’t even have to know what the statement means to know that it is true.

In contrast, a contradiction is a statement that is false in virtue of its form..

A logical contradiction is the conjunction of a statement S and its denial not-S. In logic, it is a fundamental law- the law of non contradiction- that a statement and its denial cannot both be true at the same time. Here are some simple examples of contradictions. 1. I love you and I don’t love you.

## 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.

## 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 the difference between tautology and redundancy?

Tautology is redundancies within phrases. Redundancy is any kind of repetition: phrases, sentences, paragraphs, entire books, it’s all the same; the scale isn’t important. A tautology refers to phrasing that repeats a single meaning in identical words: They followed each other one after the other in succession.

## 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.

## How do I know if I have tautology?

If you are given any statement or argument, you can determine if it is a tautology by constructing a truth table for the statement and looking at the final column in the truth table. If all of the truth values in the final column are true, then the statement is a tautology.

## Is period of time a tautology?

“extensive periods of time” contained the tautology “periods of time”.

## What do you call a person who always contradicts?

A contrarian is someone who takes an opposing view, especially for the sake of being difficult, contentious or in opposition to the generally held view. This could also be used as an adjective. A troll is, in a certain context, someone who says something deliberately for the purpose of insulting or upsetting someone.

## Why do I say things twice?

Palilalia (from the Greek πάλιν (pálin) meaning “again” and λαλιά (laliá) meaning “speech” or “to talk”), a complex tic, is a language disorder characterized by the involuntary repetition of syllables, words, or phrases.

## What is an example of contingency?

An example of a contingency is the unexpected need for a bandage on a hike. The definition of a contingency is something that depends on something else in order to happen. An example of contingency is a military strategy that can’t go forward until an earlier piece of the war plan is complete.

## What is an example of contradictory?

A contradictory statement is one that says two things that cannot both be true. An example: My sister is jealous of me because I’m an only child. Contradictory is related to the verb contradict, which means to say or do the opposite, and contrary, which means to take an opposite view.

## What is the simplest contradiction?

Similarly, a proposition which is false independently of the truth or falsity of the atomic propositions from which it is composed is known as a contradiction. The simplest example of this would be (p ∧ ¬p).

## What does tautology mean in logic?

In logic, a tautology (from Greek: ταυτολογία) is a formula or assertion that is true in every possible interpretation. An example is “x=y or x≠y”. A less abstract example is “The ball is all green, or the ball is not all green”.

## How do you get rid of tautology?

In order to avoid using tautologies, pay careful attention to the logic of what you are writing….How to Avoid TautologyRe-read and spot tautologies.Delete them, or.Change them to phrases that actually add some information to the first.

## Is reason why a tautology?

No. A tautology is an assertion, where the second half of the statement is just a direct repetition of the first half, that doesn’t add new information. … “Reason why” is just a part of speech, not a full statement. It is an unusual construction, but it is considered proper grammar.

## What is a tautological argument?

A tautology is any argument where for any combination of truth values (true/false) assigned to the predicates within it, the logical flow of the argument is such that the conclusion will always turn out true.

## Is a tautology always true?

A tautology is a formula which is “always true” — that is, it is true for every assignment of truth values to its simple components. … The opposite of a tautology is a contradiction, a formula which is “always false”.

## What is tautology contradiction and contingency?

If the proposition is true in every row of the table, it’s a tautology. If it is false in every row, it’s a contradiction. And if the proposition is neither a tautology nor a contradiction—that is, if there is at least one row where it’s true and at least one row where it’s false—then the proposition is a contingency.

## Why is tautology wrong?

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.

## What is an example of contradiction?

A contradiction is a situation or ideas in opposition to one another. Examples of a contradiction in terms include, “the gentle torturer,” “the towering midget,” or “a snowy summer’s day.” A person can also express a contradiction, like the person who professes atheism, yet goes to church every Sunday. …

## What does tautology mean?

always and for ever1a : needless repetition of an idea, statement, or word Rhetorical repetition, tautology (‘always and for ever’), banal metaphor, and short paragraphs are part of the jargon.— Philip Howard. b : an instance of such repetition The phrase “a beginner who has just started” is a tautology.

## What is the opposite of a tautology?

The opposite of a tautology is presumably a contingent statement. … (2) Contingent statement – something true because it happens to be and which is not a Tautology.

## What is the difference between tautology and pleonasm?

Pleonasm has a sense of using an unnecessary overabundance of redundant words in one description. Tautology has a sense of saying the exact same in different words, using multiple words with the same meaning.