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Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Janis Papanagnou <janis_papanagnou+ng@hotmail.com>
Newsgroups: comp.unix.shell
Subject: Re: De Morgan's laws
Date: Sat, 28 Dec 2024 19:12:08 +0100
Organization: A noiseless patient Spider
Lines: 45
Message-ID: <vkpf1p$f02q$1@dont-email.me>
References: <vkn1gl$28auc$1@news.xmission.com>
 <slrnvmub16.22so.naddy@lorvorc.mips.inka.de> <vknmc3$3v5eh$2@dont-email.me>
 <vkojcr$293ue$1@news.xmission.com> <86y0zzlnho.fsf@example.com>
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In-Reply-To: <86y0zzlnho.fsf@example.com>

On 28.12.2024 18:35, Salvador Mirzo wrote:
> gazelle@shell.xmission.com (Kenny McCormack) writes:
> 
>> In article <vknmc3$3v5eh$2@dont-email.me>,
>> Lawrence D'Oliveiro  <ldo@nz.invalid> wrote:
>>> On Fri, 27 Dec 2024 22:37:26 -0000 (UTC), Christian Weisgerber wrote:
>>>
>>>> You can also de-morgan the expression
>>>
>>> First time I heard a reference to De Morgans theorems being used as a 
>>> verb. ;)
>>>
>>> Does make it sound like you are removing something called morgan though, 
>>> doesnt it ...
>>
>> I think the word we're looking for here is: un-de-morgan.
>>
>> That is, to translate the verbose but more understandable:
>>
>> 	!foo and !bar
>>
>> into:
>>
>> 	! (foo or bar)
>>
>> via application of De Morgan's law(s) would be to de-morgan it.
>>
>> CW was suggesting the reverse operation.
> 
> I'd suggest that to write 
> 
>   !(foo or bar)
> 
> is /to de-morgan/ the expression ``!foo and !bar'', while to rewrite
> back as !(foo or bar) is /to morgan/ the expression.

I've ever always seen both directions as transformations according
to the laws of De Morgan (so neither would be en-morgan or de-morgan,
sort of).

In context of 'find' the '-and' form might be considered simpler due
to 'find's inherent 'and'-logic.

Janis