POLL 3 on the validity of a simple argument on Joe the Squid

What is the basis for reason? And mathematics?

Moderators: AMod, iMod

Post Reply

Is the argument valid?

Poll ended at Sun Feb 24, 2019 4:02 pm

No
1
100%
Yes
0
No votes
I don't know
0
No votes
The argument doesn't make sense
0
No votes
 
Total votes: 1

User avatar
Speakpigeon
Posts: 987
Joined: Sat Nov 11, 2017 3:20 pm
Location: Paris, France, EU

POLL 3 on the validity of a simple argument on Joe the Squid

Post by Speakpigeon »

This is a poll on the logical validity of the following argument:
A squid is not a giraffe
A giraffe is not an elephant
An elephant is not a squid
Joe is either a squid or a giraffe
Joe is an elephant
Therefore, Joe is a squid
Is this argument logically valid?
Either way, please articulate why.
EB
Last edited by Speakpigeon on Mon Feb 11, 2019 4:50 pm, edited 1 time in total.
Skip
Posts: 2820
Joined: Tue Aug 09, 2011 1:34 pm

Re: POLL 3 on the validity of a simple argument on Joe the Squid

Post by Skip »

At last!! You've hit upon an argument that really schmecks.
Because it doesn't contain a maybe whatever if only we knew.
Impenitent
Posts: 4330
Joined: Wed Feb 10, 2010 2:04 pm

Re: POLL 3 on the validity of a simple argument on Joe the Squid

Post by Impenitent »

therefore joe needs a tattoo

-Imp
Skip
Posts: 2820
Joined: Tue Aug 09, 2011 1:34 pm

Re: POLL 3 on the validity of a simple argument on Joe the Squid

Post by Skip »

What, like giant Jesus on his back? Or snakes winding up all his tentacles. That be pretty cool.
surreptitious57
Posts: 4257
Joined: Fri Oct 25, 2013 6:09 am

Re: POLL 3 on the validity of a simple argument on Joe the Squid

Post by surreptitious57 »


The first four premises are logically valid in relation to each other but not the last premise or conclusion
User avatar
Speakpigeon
Posts: 987
Joined: Sat Nov 11, 2017 3:20 pm
Location: Paris, France, EU

Re: POLL 3 on the validity of a simple argument on Joe the Squid

Post by Speakpigeon »

surreptitious57 wrote: Sat Jan 26, 2019 3:05 am
The first four premises are logically valid in relation to each other but not the last premise or conclusion
There's a couple of things to say here but I won't comment on that unless you vote first. Valid or not?
EB
surreptitious57
Posts: 4257
Joined: Fri Oct 25, 2013 6:09 am

Re: POLL 3 on the validity of a simple argument on Joe the Squid

Post by surreptitious57 »


As an argument it is not valid even if some of the premises are but I dont want to discuss it anymore
User avatar
Speakpigeon
Posts: 987
Joined: Sat Nov 11, 2017 3:20 pm
Location: Paris, France, EU

Re: POLL 3 on the validity of a simple argument on Joe the Squid

Post by Speakpigeon »

OK, so apparently no one on this forum is competent enough or has enough logical sense to even articulate why he thinks the argument is valid or invalid.
Even though it is a simple argument.
That sort of explains why most posters here exclusively post bullshit.
EB
Age
Posts: 20194
Joined: Sun Aug 05, 2018 8:17 am

Re: POLL 3 on the validity of a simple argument on Joe the Squid

Post by Age »

Speakpigeon wrote: Sat Jan 26, 2019 10:22 am OK, so apparently no one on this forum is competent enough or has enough logical sense to even articulate why he thinks the argument is valid or invalid.
Even though it is a simple argument.
That sort of explains why most posters here exclusively post bullshit.
EB
Is the argument logically valid?
Either way, please articulate why
surreptitious57
Posts: 4257
Joined: Fri Oct 25, 2013 6:09 am

Re: POLL 3 on the validity of a simple argument on Joe the Squid

Post by surreptitious57 »


The last two premises contradict each other so the argument is invalid
Atla
Posts: 6670
Joined: Fri Dec 15, 2017 8:27 am

Re: POLL 3 on the validity of a simple argument on Joe the Squid

Post by Atla »

Two ways come to mind to show that it's invalid:

1. Squid, giraffe and elephant are all distinct, so Joe can't be both elephant and another one at the same time.

2. We can drop 3 lines

Joe is an elephant
An elephant is not a squid
Therefore, Joe is a squid

Third line here contradicts the first two.
User avatar
Speakpigeon
Posts: 987
Joined: Sat Nov 11, 2017 3:20 pm
Location: Paris, France, EU

Re: POLL 3 on the validity of a simple argument on Joe the Squid

Post by Speakpigeon »

Age wrote: Sat Jan 26, 2019 10:59 amIs the argument logically valid?
Either way, please articulate why
This is my thread.
This thread asks a simple question. So, either you think you know the answer and you just vote before posting any comment, or you don't have a view and you can go play in the courtyard.
And if you want to know what I think, you can start your own thread and see what happens.
EB
User avatar
Speakpigeon
Posts: 987
Joined: Sat Nov 11, 2017 3:20 pm
Location: Paris, France, EU

Re: POLL 3 on the validity of a simple argument on Joe the Squid

Post by Speakpigeon »

surreptitious57 wrote: Sat Jan 26, 2019 11:35 am The last two premises contradict each other so the argument is invalid
So what?
Here is the definition of validity broadly accepted in "classical" mathematical logic:
An argument is usually said to be logically valid if all cases in which the premises are true, the conclusion is also true.
Or, equivalently, an argument is said to be valid if there is no case in which the premises are true and the conclusion is false.
And here is what you yourself say of validity:
surreptitious57 wrote: Thu Jan 24, 2019 7:09 am A valid argument is one where the conclusion is true in relation to the premises but only within the context of the argument and nothing else
So, how does that justify your answer?
EB
User avatar
Speakpigeon
Posts: 987
Joined: Sat Nov 11, 2017 3:20 pm
Location: Paris, France, EU

Re: POLL 3 on the validity of a simple argument on Joe the Squid

Post by Speakpigeon »

Speakpigeon wrote: Sat Jan 26, 2019 1:57 pm
surreptitious57 wrote: Sat Jan 26, 2019 11:35 am The last two premises contradict each other so the argument is invalid
So what?
Here is the definition of validity broadly accepted in "classical" mathematical logic:
An argument is usually said to be logically valid if all cases in which the premises are true, the conclusion is also true.
Or, equivalently, an argument is said to be valid if there is no case in which the premises are true and the conclusion is false.
And here is what you yourself say of validity:
surreptitious57 wrote: Thu Jan 24, 2019 7:09 am A valid argument is one where the conclusion is true in relation to the premises but only within the context of the argument and nothing else
So, how does that justify your answer?
EB
Age
Posts: 20194
Joined: Sun Aug 05, 2018 8:17 am

Re: POLL 3 on the validity of a simple argument on Joe the Squid

Post by Age »

Speakpigeon wrote: Sat Jan 26, 2019 1:48 pm
Age wrote: Sat Jan 26, 2019 10:59 amIs the argument logically valid?
Either way, please articulate why
This is my thread.
So what? And,

Who cares?
Speakpigeon wrote: Sat Jan 26, 2019 1:48 pmThis thread asks a simple question.
Just like I did, in this thread.
Speakpigeon wrote: Sat Jan 26, 2019 1:48 pm So, either you think you know the answer and you just vote before posting any comment, or you don't have a view and you can go play in the courtyard.
Or, there are other things in play here.
Speakpigeon wrote: Sat Jan 26, 2019 1:48 pmAnd if you want to know what I think, you can start your own thread and see what happens.
EB
Or, I can just ask you a simple question in this thread. If you do not like to answer it, then so be it but some could then say; so apparently someone on this forum is not competent enough or has enough logical sense to even articulate why they think the argument is valid or invalid.
Even though it is a simple argument.
That sort of explains why some here exclusively post bullshit.

One could also suggest that some are not capable of doing what they are expecting others to do here.
Post Reply