# Question: What Is Tautology And Fallacy?

## 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 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.

## What is the word for unnecessary?

worthless, needless, superfluous, gratuitous, redundant, useless, avoidable, unneeded, irrelevant, futile, accidental, additional, beside the point, casual, chance, dispensable, excess, exorbitant, expendable, extraneous.

## What is the opposite of a paradox?

Antonyms of PARADOX normality, explanation, success, understanding, truth, answer, regularity, solution, standard, usualness, same, proposition, certainty, accuracy, correction, axiom.

## Which statement is always true?

For a statement to be always true, there must be no counterexamples for which the hypothesis is true and the conclusion is false. If there are examples for which the statement is true, but there are also counterexamples, then the statement is sometimes 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. 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”.

## 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”.

## Why is tautology used?

Essentially, a tautology expresses the same thing, idea, or saying repeatedly. There are many reasons people use tautology in both everyday discussion and poetry, research papers, prose, and song lyrics. … Tautology can demonstrate derision, be used a poetic or literary device, or contain psychological significance.

## What does V mean in truth tables?

~X is true when X is false, and false when X is true. ” v” means “or”. ( X v Y) is true when X is true (no matter what Y is). It is also true when Y is true (no matter what X is). The only way it is false is if *both* X *and* Y are false. ”

## 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 I know if I have tautology?

If you are given a statement and want to determine if it is a tautology, then all you need to do is construct a truth table for the statement and look at the truth values in the final column. If all of the values are T (for true), then the statement is a tautology.

## What does tautological mean?

1 : involving or containing rhetorical tautology : redundant. 2 : true by virtue of its logical form alone. Other Words from tautological Example Sentences Learn More about tautological.

## What is an example of 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.

## 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. 33; Bronshtein and Semendyayev 2004, p. 288).

## 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.

A paradox, also known as an antinomy, is a logically self-contradictory statement or a statement that runs contrary to one’s expectation. It is a statement that, despite apparently valid reasoning from true premises, leads to a seemingly self-contradictory or a logically unacceptable conclusion.

## Why can no simple proposition be a tautology?

Definition: “A tautology is a propositional formula that is true under any truth assignment to each of the atomic propositions in the domain of propositional function.” Let p be a simple (or atomic) proposition (e.g. “9 is a square root of 81”). … Therefore, from the definition of tautology, p is not a tautology.

## What is opposite oxymoron?

Notes: A tautology is the opposite of an oxymoron, two words that contradict each other, such as the living dead. The words of a tautology mean the same thing: a dead corpse is a tautology because corpse itself means “dead”.

## What is an example of pleonasm?

Example 1. I heard it with my own ears. When one hears something, we can presume it is with one’s own ears. The addition of “with my own ears” is a pleonasm.

## What is the truth value of P ∨ Q?

Disjunction Let p and q be propositions. The disjunction of p and q, denoted by p ∨ q, is the proposition “p or q.” The truth value of p ∨ q is false if both p and q are false.

## What is the opposite of a tautology?

Tautology refers to a redundant use of language, “too many words”. The opposite of that would presumably be “not enough words”, excessive concision, terseness, insufficiency, curtness. 3. Contradiction refers to something going against something else.

## What are 2 words that mean the same thing?

If two words are synonymous, they mean the same thing.

## What does P → Q mean?

A proposition of the form “if p then q” or “p implies q”, represented “p → q” is called a conditional proposition. … The proposition p is called hypothesis or antecedent, and the proposition q is the conclusion or consequent. Note that p → q is true always except when p is true and q is false.

## 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.