tollens

Then ~P by modus tollens does get you ~Q, and we have the refutation.

Refutation in verse 2010

BTW, I do not get the modus tollens reference above.

"Arguing with Judge Judy: Popular 'Logic' on TV Judge Shows." Ann Althouse 2009

An alternative reading is as a modus tollens argument intended to establish the superiority of a religious based ethics.

Gertrude Elizabeth Margaret Anscombe Driver, Julia 2009

But one person's modus ponens is another person's modus tollens:

Gertrude Elizabeth Margaret Anscombe Driver, Julia 2009

The skeptical argument suggested by the empirical record may be formulated as a modus tollens

Hanging 2009

BTW, I do not get the modus tollens reference above.

"Arguing with Judge Judy: Popular 'Logic' on TV Judge Shows." Ann Althouse 2009

Notice that this form of argument is perfectly valid: the conclusion deductively follows from its premises it's a variant on modus tollens.

Are Grotesque Hypotheticals Cheap Shots?, Bryan Caplan | EconLog | Library of Economics and Liberty 2009

Of course, since this implication is unacceptable, then, by modus tollens, follows that critics of the manual theology must be wrong.

Bishop Alfonso de Galarreta chairman of the SSPX commission 2009

While the logical demonstration is true, I think it's been pretty clearly evidenced that most people don't inherently understand the principle of modus tollens or basic logic generally.

The Common Sense of Bayesianism, Bryan Caplan | EconLog | Library of Economics and Liberty 2009

The basic sentences (2: 1) - (2: 4) combined with a simple categorical sentence as the second premise boil down to what we today know as modus ponens and modus tollens.

The Statue of a Writer 2009