If your truly can't prove a negative then....

[Ana the Ist]

im·per·ti·nent


adjective 1. intrusive or presumptuous, as persons or their actions; insolently rude; uncivil: a brash, impertinent youth.

2. not pertinent or relevant; irrelevant: an impertinent detail.

3. Archaic. inappropriate, incongruous, or absurd.

4. Obsolete . (of persons) trivial, silly, or absurd.
(dictionary.com)

Let´s be charitable and assume he used it in the meaning #2.

Like...the direction this thread has taken is impertinent to where it started?

 

[Tinker Grey]

im·per·ti·nent


adjective 1. intrusive or presumptuous, as persons or their actions; insolently rude; uncivil: a brash, impertinent youth.

2. not pertinent or relevant; irrelevant: an impertinent detail.

3. Archaic. inappropriate, incongruous, or absurd.

4. Obsolete . (of persons) trivial, silly, or absurd.
(dictionary.com)

Let´s be charitable and assume he used it in the meaning #2.

Ah. I knew def 1, but not def 2.

 

[GrowingSmaller]

I can prove a universal negative.

A (true) therefoe -A (false, universally).

And vice versa...

A (false) therefore -A (true , universally)