what’s the “real world”? what if the “real world” contains non-empirical entities? or facts that aren’t susceptible to empirical verification? for example, the pythagorean theorem isn’t proven by measuring the sides of as many right-angled triangles as you can find; and goldbach’s conjecture won’t be proven by seeing if even trillions and trillions of even numbers are in fact the sums of two primes.
This is just equivocation on the terms ‘true’, ‘fact’ and ‘proven’. A “proof” produced from Euclidean axiomata and theorems is “true” as a matter of propositional calculus. The validation methods
are different for mathematical propositions, for example. Without getting into analytic/synthetic/a priori/a posteriori distinctions per Kant, Quine, et al, when the conceptual predicates themselves are non-phenomenonological, their “proofs” or validations are not going to phenomenal, either.
All of which means that if “God” is proven as a mathematical concept, I find no basis for complaint - “God” as a mathematical symbol can represent what ever we want. But “God” as a reified entity, as something
actual in the existential sense, that concept places empirical burdens on the implications of “God” as ‘real’, ‘true’, or ‘proven’.
Pythagoras’ Theorem, for example, physically exists as a real entity, but as a concept, a “brain state” in the minds of those holding that idea. The concept (the brain-state) is perfectly real in that sense – it is extended in space/time – and it even works nicely as applied to the real world. Within practical tolerances, you
can measure the sides of a physical right triangle and affirm that Pythagoras’ Theorem corresponds to our phenomenonology – the ‘real world’ is “Euclid-compatible” in that respect (this doesn’t ‘prove’ Pythagoras’ Theorem, but rather establishes correspondence between it and our local physics).
not to mention the foundational assumptions we make about the world, like that the actually
is a “real world”; that it is roughly the way it apears to us; that there is a past; and so on.
Right, we’ve been talking about that. Reality is real, by necessity, for humans who want to live. See my comments upthread to Sarpedon about holding your hand in an open flame to see how long one can deny the reality of reality, even roughly construed. To question those assumptions is to fall into solipsism, solipsism that is practical refuted by the smell of burning skin from your fingers in the flame.
and what if it didn’t say that? what if it instead responded with, “of course there’s a god; how could there not be? i don’t even understand what you’re talking about when you say “god does not exist” - that’s incoherent: saying “god does not exist” is like saying “look - here’s a square circle””
That would simply invoke a set of questions about what you mean by ‘exist’. Any “of course” begs for a basis for such a claim, and it should be trivial to provide if it’s an “of course”. It may be that we need to back all the way up and look at the concept of ‘coherent’, as claims that “not exist” is somehow conceptual incoherent suggest that that the objector himself does not have a conceptual foundation for the terms.
In any case, this would just require a detour into the conceptual foundations of the terms you are using.
i have struggled to make sense of this idea of “kinds” of existence that has been bruited about in a number of threads, and i simply cannot.
I think the concept of ‘supernatural existence’ is inchoate. The concept of ‘material existence’, however, integrates with our observations and reasoning demands nicely. Saying that ‘exist’ implies something like “extended in space/time” provides a conceptual basis, a logical principle, for discriminating between the ‘existent’ and the ‘non-existent’.
an immaterial entity exists in exactly the same way that anything exists: if the entity with the properties predicated of it is a part of the actual world; if propositions about that thing are true.
That doesn’t tell us anything at all about existence. By using ‘extended in space/time’, I can go apply that criterion, at least in principle, and often in practice, to affirm or falsify existence. That means that I have made a conceptual correspondence between the ‘reality of reality’ and my concept of ‘exist’. ‘Exist’ is now grounded, conceptually.
But your formulation here simply begs the question: what does “actual world” mean? Given the proposition “X is part of the actual world”, how do we test that proposition. If we understand “part of the actual world” to be contingent on “extended in space/time”, then we have a principled and objective basis for arriving at an answer. But
without such a definition, what does “actual” mean? Similarly, what is necessary for a proposition about a thing to be ‘true’? We can say ‘Pythagoras’ Theorem is ‘true’ in the sense that is a formal production of the propositional calculus of Euclidean geometry. That’s a good, applicable set of semantics for ‘true’ with respect to a geometric proof.
But what does ‘true’ demand to be compatible with ‘actual’ or ‘real world’?
what else could it mean? it’s not like there’s “monkey existence”, so that there’s something that is “monkeyness” that then has “monkey existence” added to it in order for there to be monkeys in the “real world”; or “trees” that, when they “exist”, exist in the “tree-way”.
Indeed, it’s problematic once you try to get away from materialist definitions. ‘Extended in space/time’ isn’t dependent on ‘monkeyness’ or ‘humanness’ or any other ‘-ness’ as a matter of cognition. Extension conceptually unifies existence without concern for any kind of ‘thing-ness’.
god exists if there is an entity in the actual world that is picked out by some referring expression or some true proposition that purports to pick out/describe god.
Again, that just begs the question of what is meant by ‘true proposition’. What makes ‘true’ true in actuality? My answer would be that ‘true’ means that the proposition corresponds with the actual state of the real world, where ‘actual’ and ‘real world’ are meaningful under the definition ‘extended in space/time’. To be
actual, a thing must be extended in space/time, and the ‘real world’ is the sum of all that is extended in space/time.
incidentally, what do you think the expression “the spherical volume of empty space with a diameter of 1 meter, that is precisely halfway between the centers of the milky way galaxy and the andromeda galaxy” actually refers to anything at any time? and if so (as it seems it must), what is it? it’s certainly not “material”…
The concept you describe certainly
is material. It’s a “brain-state” in your head, realized as chemicals, electrons, etc. that has now made its way through transmission to some (hopefully) logically similar form in
my brain, and the brains of others reading this.
But never mind that distinction; your one meter sphere of empty space is perfectly actual, and demonstrably so, by your own description of it. That one meter sphere is
measurably extended – you’ve just told me
where it is spatially, and how big it is… how it is extended in space/time. If I had the transportation means to visit that location, I could measure the space (or whatever happens to be there besides just pure dimension).
I think you are supposing that ‘empty space’ somehow doesn’t
exist, because it has no or very little mass contained within it. But space/time
itself is actual – that’s how gravity works, and affects ‘empty space’. The “fabric” of space/time is distorted by mass, which is why the earth orbits the sun, for example. The “empty space” the earth is hurtling through is an actuality, an extension of space/time. Being perfectly devoid of mass doesn’t make extended space any less actual or real.
so much the worse for “knowledge as performance”…
That’s dogma, talking there.
…just like you don’t. but how could you? justifications have to stop somewhere or else go on endlessly, which is the same thing as being unjustified.
They run to ground in our commitment to the reality of reality. We do not have logical justification for embracing reality as real; it’s simply a necessity that we do so if we want to live. By choosing to live, we break the regression, and necessarily embrace beliefs that provide a ‘baseline’ for our empistemic justifications.
how do you demonstrate/justify your belief in other minds? or the past? or the real world? or the reliability of your senses?
As above, the baseline is ‘reality is real, and our perceptions generally reflect the actual state of the real world’. This is a commitment we cannot avoid making. From that, conclusions like the belief in other minds rationally proceed. But the reality of reality and generally reliability of the senses are fundmamental, necessary (and in many cases involuntary) commitments.
-Touchstone