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対偶 (論理学)
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1. Contraposition​For contraposition in the field of traditional logic, see Contraposition (traditional logic). For contraposition in the field of symbolic logic, see Transposition (logic). In logic, contraposition is a logical relationship between two conditional statements. For example, take the following proposition: "All bats are mammals", which can be stated equivalently as the conditional statement "If something is a bat, then it is a mammal.
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