A Counterexample to Modus Ponenses. Mandelkern, M. The Journal of Philosophy, 2020.
bibtex   
@article{MandelkernPonenses,
	Author = {Matthew Mandelkern},
	Date-Added = {2020-07-03 12:07:06 +0100},
	Date-Modified = {2020-07-03 12:07:06 +0100},
	Journal = {The Journal of Philosophy},
	Title = {A Counterexample to Modus Ponenses},
	Year = {2020}}
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