1The rule of logic stating that if a conditional statement (“if p then q”) is accepted, and the antecedent (p) holds, then the consequent (q) may be inferred.

‘The statement that q follows by modus ponens from the other two stated as known in the antecedent of the subjunctive principle P; this principle counts on the person to draw the inference to q.’

‘It could be a premise either, as some say, as the premise of a propositional scheme such as the modus ponens, or, as others assume, as the conditional premise of a hypothetical syllogism.’

‘We also noted that one of the most fundamental inferences concerning the conditional is modus ponens: a, a c c.’

‘This formal fallacy is often mistaken for modus ponens, a valid form of reasoning also using a conditional.’

‘He maintained that these methodological principles underlie evaluative practice in science just as modus ponens underlies deductive inference.’

‘From a conditional statement, one can construct two types of valid inference: modus ponens and modus tollens.’

1.1An argument using modus ponens.

‘Consider, for example, propositional logic: here one can start from self-evident axioms and proceed to deduce theorems by argument forms - modus ponens, for example - that are themselves self-evidently valid in an obvious sense.’

‘The first three points are a valid form of argument, in the form of modus ponens.’

‘Robustness was meant to ensure that an assertable conditional is fit for modus ponens.’

Origin

Latin, literally ‘mood that affirms’.

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