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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Interfacing Ada With Full Runtime Directly to Electronic Chips
Date: Tue, 3 Jan 2017 21:34:29 +0100
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Date: 2017-01-03T21:34:29+01:00
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On 2017-01-03 19:02, Shark8 wrote:
> On Tuesday, January 3, 2017 at 3:34:33 AM UTC-7, Dmitry A. Kazakov wrote:
>> On 2017-01-03 06:33, Shark8 wrote:
>>
>>> That's really interesting, because the system I want to do
>>> [ultimately] is a ternary computer -- for which tri-state logic is a
>>> perfect fit.
>>
>> Out of curiosity, why tri-state logic and not full four-state one?
>> Tri-state is incomplete in some operations (e.g. in implication).
>
> The completeness of the logic-system depends on which logic-system
> is  being used -- there are several for three-valued logic -- but it is a
> non-issue because you can use full Boolean logic (e.g.) by defining 0 to
> be True and ±1 to be False (i.e. using inverse-logic).*

[...]

I see, it is just a ternary system and not logic in the sense of lattice 
and inference, like {False, True, Unknown}.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de