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Quantifier, Quantified and Duality Statements in Logic

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Estimated time: 3 minutes
  • Universal quantifier (∀)
  • Existential quantifier (∃)
Maharashtra State Board: Class 12

Definition: Quantifiers

A quantifier is a symbol used to specify the quantity of elements in a domain for which a statement is true.

  • Universal Quantifier (∀): “for all” or “for every”
  • Existential Quantifier (∃): “there exists at least one”
Maharashtra State Board: Class 12

Definition: Quantified Statement

A quantified statement is an open statement that becomes a definite statement when a quantifier is applied to it.

Maharashtra State Board: Class 12

Definition: Duality

Two formulae A and B are said to be duals of each other, if either one can be obtained from the other by replacing ∧ by ∨ and ∨ by ∧.

  • Replace AND (∧) with OR (∨) and OR (∨) with AND (∧)

Shaalaa.com | Introduction to Logic: Statements, Negations, and Quantifiers

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Introduction to Logic: Statements, Negations, and Quantifiers [00:23:05]
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