Can we know that something doesn't exist?

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fast
 
Reply Tue 2 Mar, 2010 01:41 pm
@Night Ripper,
Night Ripper;134690 wrote:
According to you, anything with any amount of justification, as long as it's above absolutely none at all, is "justified".

That's like saying that anything that isn't perfectly round is "flattened".

Consider the difference between adequate justification and inadequate justification. There are (at least) three necessary conditions of knowledge, and one of them is adequate justification. Generally, we speak in shorthand, and if I say that I have a justified belief, that is shorthand for I have an adequately justified belief.
 
ughaibu
 
Reply Tue 2 Mar, 2010 01:46 pm
@fast,
fast;134695 wrote:
There are (at least) three necessary conditions of knowledge, and one of them is adequate justification.
Unfortunately, you cant know that your justification is adequate, or that your belief is true, without suffering a regress.
 
Fil Albuquerque
 
Reply Tue 2 Mar, 2010 01:50 pm
@fast,
fast;134695 wrote:
Consider the difference between adequate justification and inadequate justification. There are (at least) three necessary conditions of knowledge, and one of them is adequate justification. Generally, we speak in shorthand, and if I say that I have a justified belief, that is shorthand for I have an adequately justified belief.
 
Night Ripper
 
Reply Tue 2 Mar, 2010 01:50 pm
@fast,
fast;134695 wrote:
Consider the difference between adequate justification and inadequate justification. There are (at least) three necessary conditions of knowledge, and one of them is adequate justification. Generally, we speak in shorthand, and if I say that I have a justified belief, that is shorthand for I have an adequately justified belief.


I think "adequately justified" is redundant. There is justified and unjustified. The phrase "inadequately justified" means unjustified.
 
Zetherin
 
Reply Tue 2 Mar, 2010 01:51 pm
@ughaibu,
ughaibu;134700 wrote:
Unfortunately, you cant know that your justification is adequate, or that your belief is true, without suffering a regress.


But that does not mean we can't know. Often people do not even know that they know something.

Night Ripper wrote:

According to you, anything with any amount of justification, as long as it's above absolutely none at all, is "justified".

That's like saying that anything that isn't perfectly round is "flattened".


I never said that. The amount of justification required for a belief to be justified varies.
 
JPbokker
 
Reply Tue 2 Mar, 2010 01:51 pm
@kennethamy,
kennethamy;134684 wrote:
But, again, you are assuming that because we cannot be certain, that we cannot know. So, you assume that knowledge implies certainty. Isn't that so?


That's right, I believe that certainty is a requisite of knowledge.

Quote:
I might agree with you that there is nothing we can be certain about, but that doesn't mean that I have to agree with you that there is nothing that we can know. Not if knowledge does not imply certainty. So, that is really what you have to show; that knowledge implies certainty.


I think that here the problem lies with the definition of knowledge. For me, to declare that you know something, you have to be certain of it. Otherwise you are surely diluting the term knowledge, and might as well always declare "I probably know something" because, by definition, you are not certain of it.
 
ughaibu
 
Reply Tue 2 Mar, 2010 01:58 pm
@Zetherin,
Zetherin;134709 wrote:
But that does not mean we can't know. Often people do not even know that they know something.
Sure, it depends on the definition of "knowledge" that you're using.
 
Zetherin
 
Reply Tue 2 Mar, 2010 02:00 pm
@ughaibu,
ughaibu;134718 wrote:
Sure, it depends on the definition of "knowledge" that you're using.


Which definition are you using? I was referring to the JTB model.

---------- Post added 03-02-2010 at 03:02 PM ----------

JPbokker wrote:

For me, to declare that you know something, you have to be certain of it.


Yes, and that is fine. But keep in mind that claiming to know, and knowing, are different. You may not feel comfortable claiming to know unless you are certain (I relate to this sometimes), but that says nothing about your knowing.
 
Fil Albuquerque
 
Reply Tue 2 Mar, 2010 02:03 pm
@JPbokker,
JPbokker;134710 wrote:
That's right, I believe that certainty is a requisite of knowledge.



I think that here the problem lies with the definition of knowledge. For me, to declare that you know something, you have to be certain of it. Otherwise you are surely diluting the term knowledge, and might as well always declare "I probably know something" because, by definition, you are not certain of it.
 
ughaibu
 
Reply Tue 2 Mar, 2010 02:04 pm
@Zetherin,
Zetherin;134719 wrote:
Which definition are you using? I was referring to the JTB model.
Me too, as I was responding to Fast, who subscribes to JTB. I dont think there's any satisfactory definition, myself.
 
kennethamy
 
Reply Tue 2 Mar, 2010 02:06 pm
@ughaibu,
ughaibu;134693 wrote:
I didn't make that claim.


Yes, I know. I did not mean to suggest you had. Sorry.
 
Fil Albuquerque
 
Reply Tue 2 Mar, 2010 02:06 pm
@Fil Albuquerque,
I mean do you think that Knowing is about being aware ? or just retained information that later on is "confirmed" ?
 
Zetherin
 
Reply Tue 2 Mar, 2010 02:07 pm
@Fil Albuquerque,
Fil. Albuquerque;134724 wrote:


In order to know P, one must believe P. So, no, he wouldn't have known until he believed.
 
Night Ripper
 
Reply Tue 2 Mar, 2010 02:08 pm
@Zetherin,
Zetherin;134709 wrote:
The amount of justification required for a belief to be justified varies.


That sounds really ad hoc. Varies based on what?
 
Fil Albuquerque
 
Reply Tue 2 Mar, 2010 02:11 pm
@Zetherin,
Zetherin;134728 wrote:
In order to know P, one must believe P. So, no, he wouldn't have known until he believed.


---------- Post added 03-02-2010 at 03:15 PM ----------

...Is belief absolute or relative ? is there any degrees of progressive belief ?
 
kennethamy
 
Reply Tue 2 Mar, 2010 02:15 pm
@Night Ripper,
Night Ripper;134729 wrote:
That sounds really ad hoc. Varies based on what?


Varies with the belief. But it is not only the amount of course, it is the kind too. And it also depends on what is at stake.

Knowledge and Practical Interests. Jason Stanley

This view of justification is called, "contextualism".
 
Zetherin
 
Reply Tue 2 Mar, 2010 02:16 pm
@hue-man,
Night Ripper;134729 wrote:
That sounds really ad hoc. Varies based on what?


I think it depends on the belief. Some beliefs may require more justification than others.

Fil. Albuquerque wrote:


Oh, he believed but he wasn't certain? Was he justified? Then, yes, he knew. He just wasn't certain that he knew. Happens all the time.
 
Fil Albuquerque
 
Reply Tue 2 Mar, 2010 02:24 pm
@Zetherin,
Zetherin;134736 wrote:
I think it depends on the belief. Some beliefs may require more justification than others.



Oh, he believed but he wasn't certain? Was he justified? Then, yes, he knew. He just wasn't certain that he knew. Happens all the time.


Can someone with 99.999% of belief (relative conception of belief) be certain that he is certain ?
 
Zetherin
 
Reply Tue 2 Mar, 2010 02:26 pm
@Fil Albuquerque,
Fil. Albuquerque;134741 wrote:
Can someone with 99.999% of belief (relative conception of belief) be certain that he is certain ?


A percentage based conception of belief? I've never heard of such a thing. I don't know how to answer your question.
 
Fil Albuquerque
 
Reply Tue 2 Mar, 2010 02:32 pm
@Fil Albuquerque,
 
 

 
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