1. What does it mean to assume that nature exists?
Well, that seems to be the question I am asking.
I'm confused. You're saying that science works with the assumption that nature exists. I'm asking what it means to make an assumption that nature exists, and you're saying that this is the question you're asking.
Do you see my confusion? You made a claim that science does x. I'm asking what x means, and now you're saying that this is the question you're asking?
Science says it is in the business of investigating Nature and of formulating natural explanations for natural phenomena.
When Science investigates Nature it follows a fairly rigid formula.
This formula is based upon a few assumptions, one of which is that Nature exists.
None of the above addresses the question that I asked. You're simply adding another claim that science follows strict formulas; beyond that you're repeating yourself.
2. How would the world be if nature did not, in fact, exist?
There would NOT be a "world" if Nature (the world, the cosmos, the universe) did not exist.
I don't quite think you're understanding the question. Suppose I see a tree outside my window, and nature exists. Compare that to my seeing a tree outside my window, and nature not existing. How are the two different?
After all, it looks to me like that tree is there; so exist or not, it at least appears to me as if a tree is there. Exist or not, it looks to me like on occasion that tree bends in the wind. Exist or not, it looks to me like the leaves turn colors and fall off at certain times.
So what is the difference between entertaining that it exists, or possibly doesn't exist; and simply not worrying about it--focusing instead on what seems to be happening to it?
3. And why does it matter for scientific inquiry?
All Science is doing is investigating Nature. It doesn’t drive a nail, lay a brick or start a fire.
So IF there was NO Nature for it to investigate, it would be doing nothing, there would be nothing for it to investigate. So I don’t think this is what Science means when it says it can only assume that Nature exists.
As I'm not sure what you mean by the assumption that Nature exists, I cannot comment on the quality of the above argument. I will interject, however, that I can investigate the narrative aspect of dreams. I can investigate motivations of characters in fictional works. I can investigate objects in 7-dimensional exotic geometries.
Is this a counterargument, or are you claiming that dreams, fictional worlds, and 7 dimension exotic geometries exist?
If you presume that Nature does NOT exist, it would mean “nothing” exists. There would be no “motion” or “non existing ball” and “no you” to study it. I don’t think this is what Science is saying.
This is a contradiction. In order for me to presume that nature does not exist, I have to be there. If I'm not there, what is presuming?
Once science accepts that it assumes Nature exists, the next thing it assumes is that Nature is independent of the individual and what he/she thinks or does. Nature (the world, the cosmos, the universe) exists “outside” of us. Nature doesn’t care about the individual, it gains or loses nothing whether we (as individuals) exist or not.
Okay, so let's suppose I just dump science then. I really care nothing about science, and can do without. The only thing I care about is truth, but I care intensely about it.
So instead of being like science, where I would presume that nature operates independently from me, I'm going to just say that I don't know if it does or not. So what I'm going to do instead is look at it and figure it out. Whatever methods I use, I'm going to make up (instead of following strict formulas)--but my goal is that I'm going to try to make sure the method reveals the correct answer. If nature is dependent on me, I'm going to want to find out exactly how, under what conditions, and so on; if it's not, I'm going to want to find out under what conditions it's not just in case I missed something.
I wonder what would happen if I followed this kind of non-scientific approach at things, rather than start with all of the assumptions that science makes.