[serious];65579551 said:
Ultimately, words have meanings. The most literal way of defining fact is as an observation. Something we directly see. Common descent is not something directly observable. Pretending it is doesn't actually help your case. I'm the first one to try and tie down creationists when they are getting quirrelly with definitions. I can't very well Ignore misuse of terms on my own side. Common descent is not an observation, so in the most literal sense of the word, it's not a fact. It's a model that explains all observable facts. It's the best model we have. It's the only rational model at all. But it's still a model subject to refinement to better fit new information. A good parallel would be the refinement of the model of the atom. The modern interpretation is no more a "fact" than the Bohr model was. Both are models progressively better explaining the observations of the atom.
I don't think you really understand the implication of what you just written.
I claim that implied facts are fact. If you dispute this then you dispute the correctness of logic, which states that all theorems are true. Further more logic states that theorems (implications) does not tell us anything new, but only presents the postulate (or observable facts in our case) in a "more interesting way" or make the claims of the postulates more explicit.
Now, tell me,
a) is life a nested set?
b) can life be produced in some other way than we already know about?
If you answer is 'yes' to a) and 'no' to b) then common ancestor is an implied fact.
Because common ancestor is a implied fact, that is a a 'theorem' in the language of logic, then it follows, from well know principles of logic, that a) common ancestor is true and b) noting new was added to the facts (observations) that wasn't there before. From this follow that common ancestor is an observed fact because
all facts it was derived from are observed facts.
Now, is it a fact that Pluto orbits the sun?
Yes it is a fact, for the very
same reasons common ancestor is a fact....
Either you can argue that common ancestor is not a fact, but then, in the name of consistency, you should also argue that it is not a fact that Pluto orbits the sun. Such claims has sever consequences, because it means you are not sure, i.e. it is not a fact, and if you are not sure, you might a swell start believe that Pluto might suddenly fly away from the sun for no reason at all.... do you believe that? I do not think you do that, I think you believe Pluto has a stable orbits around the sun, don't you? So you say it is fact...
So how can you say that common ancestor is not a fact then? Well, logically, you cannot... why?
Well...
If you say that common ancestor is not a fact then you in effect reject the law of the excluded middle, that is you reject the deduction rule "there is NO third alternative". In other words you claim there exists a third alternative.... and what is that third alternative? Well, that is what the creationist always claimed it to be; spontaneous creation and "kinds". But I claim there is no such third alternative, because I do NOT reject law of the excluded middle and because of that i can say
is a fact that common ancestor is a fact. But creationist denies the law of the excluded middle - and so do you as well if you say that common ancestor is not a fact.
I don't think you intended to say this because you accept common ancestors so I think you also accepts the law of the excluded middle. And that is a good thing to do, because that means that you suddenly can know a lot of things
as facts! For instance that common ancestor is an observed fact. But if you reject the law of the excluded middle, as creationists does, then you reject a lot of knowledge, and that is why I am claiming creationism to be anti-knowledge; they deny knowledge by rejecting the excluded middle (when it suits them) as a valid rule of deduction.
When a creationists say "we cant know" on these grounds..... that is fine with me, and they have the right to do that..... if it wasn't for a small thing; creationist only reject the exuded middle when it suits their own arguments for the moment. What do we call somebody that does that... "dishonest", right?
To end this way to long reply:
Based on what you said, you seams to underestimate how sophisticated creationists argument actually are. Their argument is not based around facts etc but on deep philosophical issue about knowledge. It may look like it is an argument about observational and biology etc, but it isn't (because they cannot win such argument ever, because it would be to argument against facts), so instead it is about how we know what we know... and they use everything they ever can ever use in order to make it look like they are right.. but they are not, because they are inconsistent and twist things only to suit them for the moment, and keeps to rules only as long as it confirms to what they believe, just so they the next second can drop the rule they used if it does not fit them any more. This is what you need to understand about creationism and that is why it is nonsense. There is no intellectual honesty, whatsoever, with creationism. Problem is that it touches such deep philosophical issues that most people wont recognize them, and even if they do, not understand them full - not even I do that because sometimes when I try to understand their argument on the depth the intellectual madness contained within it drives mes me toward crazy..... I am serious, and I am not joking, when you think about their argument you can literally feel the madness engulf your mind and I cant deal with it. I have to stop and come back to it days later. It is pure madness....
NOTE: in the context of the text I have not explicitly written 'observable fact' where it should be, but just 'fact' because I was to lazy to write it out and because I do not make any distinction bewteen them (as explained why).