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From: "G.B." <bauhaus@notmyhomepage.invalid>
Newsgroups: comp.lang.ada
Subject: Re: Tests in a software release
Date: Sat, 4 Nov 2017 11:15:10 +0100
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Date: 2017-11-04T11:15:10+01:00
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On 03.11.17 13:49, Shark8 wrote:
> On Friday, November 3, 2017 at 1:24:53 AM UTC-6, G.B. wrote:
>>
>> __
>> (*) It has been proven is that programs proven correct
>> will of necessity be rare or impractical.
> 
> Counterproof:
> The Ironsides DNS is proven correct, is practical, and was used to test whether formal methods & provers can be used practically to produce non-trivial useful programs. -- http://ironsides.martincarlisle.com/

How is "practical" the opposite of "rare or impractical"?

This was a rare opportunity for high-salary staff
with rare gifts to produce something extraordinary.

A counterproof will be programs proven correct
that are both not rare and also practical.