What is tautology cite example what is meant by tautology in logic?

In mathematical 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”. Similarly, “either the ball is green, or the ball is not green” is always true, regardless of the colour of the ball.

How do you prove tautology by logical equivalence?

Two logical statements are logically equivalent if they always produce the same truth value. Consequently, p≡q is same as saying p⇔q is a tautology. Beside distributive and De Morgan’s laws, remember these two equivalences as well; they are very helpful when dealing with implications. p⇒q≡¯q⇒¯pandp⇒q≡¯p∨q.

How do you prove a statement is a 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 makes something a tautology in logic?

tautology, in logic, a statement so framed that it cannot be denied without inconsistency. Thus, “All humans are mammals” is held to assert with regard to anything whatsoever that either it is not a human or it is a mammal.

What are 5 examples of tautology?

Examples of Tautology:

  • The hot summer sun was scorching.
  • I personally made this card for you with my own hands.
  • The soggy ground was wet and covered in mud.
  • I apologize because I am very sorry that I broke your bowl.
  • The teacher assisted me by helping me to complete the math problem.

What is called tautology?

In literary criticism and rhetoric, a tautology is a statement which repeats an idea, using near-synonymous morphemes, words or phrases, effectively “saying the same thing twice.” Tautology and pleonasm are not consistently differentiated in literature.

How do you write 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.

Which one of the following is an example of tautology?

For example, saying “the ATM machine” is a tautology, because the M already stands for machine.

What is tautology in truth table?

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”.

Why is tautology used?

Tautology is a literary device whereby writers say the same thing twice, sometimes using different words, to emphasize or drive home a point. It can be seen as redundancy, a style fault that adds needless words to your idea, statement, or content; or it can be defended as poetic license.

What is tautology in computer science class 12?

Answer: 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. I think u r in class 11th or 12th.

What is tautology and contradiction with example?

1. A tautology is an assertion of Propositional Logic that is true in all situations; that is, it is true for all possible values of its variables. A contradiction is an assertion of Propositional Logic that is false in all situations; that is, it is false for all possible values of its variables.

What is the difference between tautology and contradiction in logic theory?

A compound statement which is always true is called a tautology , while a compound statement which is always false is called a contradiction .

Is P → Q → [( P → Q → Q a tautology?

(p → q) ∧ (q → p). (This is often written as p ↔ q). Definitions: A compound proposition that is always True is called a tautology.

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