RexAllen wrote:Thus, on Kant’s view, the most fundamental laws of nature, like the truths of mathematics, are knowable precisely because they make no effort to describe the world as it really is but rather prescribe the structure of the world as we experience it. By applying the pure forms of sensible intuition and the pure concepts of the understanding, we achieve a systematic view of the phenomenal realm but learn nothing of the noumenal realm. Math and science are certainly true of the phenomena; only metaphysics claims to instruct us about the noumena.
By the nature of reason itself, we are required to suppose our own existence as substantial beings and the possibility of our free action in a world of causal regularity. The absence of any formal justification for these notions makes it impossible for us to claim that we know them to be true, but it can in no way diminish the depth of our belief that they are.”
There is a metric boatload of misapprehension in the above in your claimed transformation of metaphysical quandaries into material certainties. It doesn't work that way. Your "
nothing of the noumenal realm", and "absence of
any formal justification" use completely unjustifiable superlatives to assert total severance of the phenomenal and noumenal as an incontrovertible and absolute fact rather than what they really are: philosophical misgivings on the limits of epistemology.
Let us then offer a formal justification and proof of the knowability of one thing about the noumenal which will completely falsify your certitude of complete severability:
Operationally, we simply have no reason to care about any "real" properties of the noumenal which never manifest as the phenomenal. If my coffee cup mimsies all its borogroves I simply have no reason to care if mimsying and borogroves never affect my ability to use it to drink coffee. Likewise if boron atoms fornicate with iodine in some unknown realm we simply don't care so long as mass/energy, charge, spin etc are conserved and the various descriptive equations and predictions continue to work in this realm.
And we have a consistent epistemological methodology which provides measurable surety about some aspects of the noumenal: induction. So long as induction works, we have "true" knowledge in our heads that the "real" properties of an entity give rise to the phenomenal properties we observe. And that isometric relation between the noumenal and phenomenal is itself a "real" property of the entity and other entities involved in that transform. And we know that to be "true" to exactly the same surety that we know the observed phenomenal properties to be true.
So there you have it. Some justification of some knowledge of the noumenal and its relation to the phenomenal. Your declaration of absolute certainty of absolute severability is falsified. Defunct.
-- TWZ