not-A

The principle of Identity is usually written symbolically thus: _A is A; not-A is not-A_.

Logic Deductive and Inductive Carveth Read 1889

To symbolise this we ought to alter the usual formula for Identity and write it thus: _If B is A, B is A; if B is not-A, B is not-A_.

Logic Deductive and Inductive Carveth Read 1889

We can safely infer that either not-A or not-B; and since we were given that A, we can safely infer that not-B.

Logical Form Pietroski, Paul 2009

If the B that defines fantasy is simply not-A, then SF and fantasy exist as concentric zones, the former nestled within the latter but excluding by definition that which exists outside its strictures, identifying it by negation.

Once More Into The Fray Hal Duncan 2007

A and to not-A (together with there being some prohibitions on others interfering).

Legal Rights Campbell, Kenneth 2009

For suppose we are given the following premises: A; and if A, then either not-A or not-B.

Logical Form Pietroski, Paul 2009

In many respects, for a large contingent of SF writers and readers who would seek to make exactly that distinction, I suspect the simple answer is that B equates to not-A, that it is simply the absence of rationalisation that, for them, distinguishes a work out as fantasy rather than SF.

Archive 2007-12-01 Hal Duncan 2007

In many respects, for a large contingent of SF writers and readers who would seek to make exactly that distinction, I suspect the simple answer is that B equates to not-A, that it is simply the absence of rationalisation that, for them, distinguishes a work out as fantasy rather than SF.

Once More Into The Fray Hal Duncan 2007

If the B that defines fantasy is simply not-A, then SF and fantasy exist as concentric zones, the former nestled within the latter but excluding by definition that which exists outside its strictures, identifying it by negation.

Archive 2007-12-01 Hal Duncan 2007

And one reason we think that is that at a given time, we might do either A or not-A.

Behe challenges Miller 2007