What is a statement that is always true, whatever you insert, called?
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Tautology
“A or not A” is always true.
💡 Did you know? Its opposite is a contradiction.
6 of 12 questions with answers
What is a statement that is always false called?
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Contradiction
“A and not A” is always false.
💡 Did you know? Proofs use it deliberately (proof by contradiction).
What is the logical “and” connection of two statements called?
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Conjunction
It is true only if both parts are true.
💡 Did you know? Symbol: ∧.
What is the logical “or” connection of two statements called?
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Disjunction
It is true if at least one part is true.
💡 Did you know? Symbol: ∨.
What is reversing the truth value of a statement (¬A) called?
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Negation
It turns true into false and vice versa.
💡 Did you know? Symbol: ¬.
What is the “if … then” connection in logic called?
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Implication
From a false premise anything follows.
💡 Did you know? Symbol: →.
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