I totally agree with the idea that all we know about the universe are our own perceptions and that the idea of something (the universe) existing outside us is an untestable belief.
And that's not really where I'm coming from. What I'm saying is that the idea that the universe exists independently from the very minds which assigned it with all of its attributes, is either: (i) itself an objectively testable model (ie: scientific) or; (ii) an untestable one (a belief).
Either way, both (i) and (ii) require our minds, and thus neither alternative when put to an objective test, stands as evidence that the universe exists independently from human minds. The only evidence produced thus far, supports mind dependence.
As such, there is no 'what exists outside' or 'what exists inside' (the 'inside' and 'outside' terms do not convey the same meanings as 'dependent' or 'independent')
mmarco said:
By the way, also the existence of our own body is an arbitrary assumption, since also our body is a perception.
Well I'd say that's a pretty odd statement. I can do objective tests on what we call a 'body' and produce glowing results which would verify science's various models for what a 'body' is. This is all it takes for us to assert that 'a body' exists in science's objective reality .. all without any assumptions at all.
No assumptions are necessary when it comes to following the widely published scientific process. 'Assumptions' are part of the logical thinking process .. which is not science. When science uncovers some assumption,
it tests it.
mmarco said:
According to the well known "Cogito ergo sum", which could be better rephrased as "I perceive then I am", all we know for sure is the existence of our own mind.
However, unless we choose solipsism (which means that all our life is nothing but a dream created by our own mind), we have to make the hypothesis that "something" exists beyond our own mind.
I posted on this frequently misinterpreted aspect, in conjunction with solipisism,
in another thread here:
SelfSim said:
Descartes said "I think therefore I am" (which begs the question: "Don't you mean you think therefore you think you are?"). This is not Solipsism either because it would say: "I know I am because I think, but I don't know anything else" (which the begs the question: "Do you count what you mean by 'I' and by 'existing', as among the things you do know, or among the things you don't know?"
The mind/model dependent (MDR) hypothesis says: "What I mean by 'thinking', and what I mean by 'being', involve a process of meaning generation that depends sensitively on how my mind works, including what I mean by 'how my mind works'. It may be less impressive, but that's the price of actually being 'true' (in the scientifically (objectively) demonstrable sense).
Basically, IMO, classical philosophical Solipsism is quite useless (ie: is a pointless waste of time) and is thus not what the Model (or Mind) Dependent Reality (MDR) hypothesis is all about. The MDR hypothesis is a scientifically formed, objectively testable one.
mmarco said:
In this case, I think that a reasonable question is: why all these perceived natural phenomena can be described and predicted so well through a specific system of mathematical equations?
I don't think what you're noticing, is necessarily limited to math descriptions(?) Any
operational description our minds can come up with, (of the universe and any of its corresponding predictions), will exhibit the same/highly similar consistencies .. Don't get me wrong, math modelling is probably the best operationally descriptive tool we've ever come up with .. but there's a bigger point worth making about the consistency itself.
See, human minds that are similar enough to agree on some observation, simply choose to not count any mind
not similar enough to agree with them. That's how "objectivity" works, it is a class of consistencies perceived by enough people to make it a working concept to base science on.
But we already know there are consistencies in perception, none of this is any kind of test of something existing independently from a mind, because those who believe in the existence of some mind independent reality (MIR), can always just not count any mind that doesn't agree with them. So, in what other contexts do we find people discounting everyone who cannot agree with them for whatever reason?
Mind Dependent Reality (MDR) building is a communal task for like-minded individuals .. and so is belief in some MIR .. but only the former (MDR)
is testable because it makes predictions that you can't get from any competing model, whereas MIR belief can be seen as failing objective tests over and over, because
it can't include the need to use similar minds if it is supposed to be mind independent reality.
The thing about math equations in modelling, is that they don’t let us get away with discounting things that people don’t agree with (its self-tracking) .. so it fits the need of maintaining objectivity for the purposes of testing and predicting from those results.