modus ponens

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modus ponens

(ˈməʊdəs ˈpəʊˌnɛnz)
n
(Logic) logic the principle that whenever a conditional statement and its antecedent are given to be true its consequent may be validly inferred, as in if it's Tuesday this must be Belgium and it's Tuesday so this must be Belgium
[literally: mood that affirms]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Is modus ponens valid for the indicative conditional?
On a Supposed Counterexample to Modus Ponens, BERNARD D.
Vann McGee has set out several arresting examples which purport to show that modus ponens fails when applied to a conditional whose consequent is itself a conditional ("A Counterexample to Modus Ponens," The Journal of Philosophy 82 [1985] pp.