Sujet : Re: Why Python When There Is Perl?
De : Physfitfreak (at) *nospam* gmail.com (Physfitfreak)
Groupes : comp.os.linux.advocacyDate : 23. Mar 2024, 23:45:51
Autres entêtes
Message-ID : <utniif$1o32m$2@solani.org>
References : 1 2 3 4 5 6 7 8 9
User-Agent : Mozilla Thunderbird
On 3/23/2024 1:46 AM, Physfitfreak wrote:
On 3/22/2024 8:40 PM, Physfitfreak wrote:
On 3/22/2024 4:04 PM, Farley Flud wrote:
On Thu, 21 Mar 2024 21:01:30 -0500, Physfitfreak wrote:
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IMP
0 IMP 0 = 1
0 IMP 1 = 1
1 IMP 0 = 0
1 IMP 1 = 1
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How can that be explained?...
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A = "If it is raining"
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B = "The sky is cloudy"
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The only way that A => B is false is if A is true and B
is false.
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There we go again. I spend half hour concocting a new baby problem based on that, then after posting it I see you've already given the answer for everybody here to see...
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Your description and the example you brought are pretty good. Not a single one of the other COLA members would be able to post such a convincing answer. I hope this tells those idiots something about how they treat you here.
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But what if the implication is based on "Trump doesn't pay his taxes" being always true? We'll then have,
A = "If you pay your taxes"
B = "You are not Trump"
Now we'll get:
A.....B
-------
0 IMP 0 = 0
0 IMP 1 = 0
1 IMP 0 = 0
1 IMP 1 = 1
and the results different from the example you gave. No? Isn't an IMP relation supposed to have only one 0 and the rest 1's? How come now we have the opposite of that?
You may respond as, "that's how it works when you switch B with ~B. The negation reverses all four cases of the results." Sure, but!
But, what is wrong with taking the absence of a condition as a condition of its own, and not as the negated form of that condition? Not being Trump is a condition of its own. If you are not Trump, the condition is 1 and if you are Trump, the condition is 0. This can as validly be used in forming an IMP relation between A and B, not between A and ~B.
Therefore, I think, basing the description of an IMP relational logic on how the results will look like (four 1s and one 0) is a mistake, cause results vary depending on what the B condition is. Some sources on the internet do that, and they are thus making a mistake. That is, instead of going for the heart of what IMP means and does, they use the mutable results of IMP relational logic.
It's like when asked how a Corvette can be identified, giving the answer, "When it's red, it's a Corvette." Puh.
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