Another way of looking at it.
One of the things which people can imagine, and Rene Descartes, who worried quite a lot about what he could imagine, quite excelled at it, is called mathematics. I don't think anybody should try to dispute that mathematics are entirely imaginary, or at least, only existent in the human mind. Nor should they dispute, in my opinion, that, oddly enough, math does seem to be able to create useful descriptions of 'natural phenomena.' These phenomena are, for convenience, assumed, though maybe not initially by Descartes, to be not entirely imaginary. Due to the limitations of human understanding, this is not provable, mathematically or otherwise, but for most people, eventually even Descartes, I think, it's an article of faith.
Over the last several centuries, considerable effort has been given to developing and confirming this correspondence between the logic of mathematics and the assumed actuality of the universe, with such good result that in the last couple centuries some research has reversed the process and looked to invent the mathematical explanation first, to find a clue to the underlying natural processes. First probably in early chemistry, where we find things like the gas laws and stoichiometery first suggested to their discoverers by the elegant simplicity of the arithmetic. Two great triumphs of modern science came in this fashion, in the microcosmic realm of particle physics, a mathematical description called quantum mechanics, and, on the cosmic scale, general relativity. Great swaths in both these arenas are considered totally confirmed experimentally but by no means all, much of the math is still speculative and reconciliation between the two systems is still problematic. There is no rule that things mathematical must be real, as far as can be seen, it is simply our good fortune that quite a bit of it works out. There is also considerable leeway, the massive calculations of general relativity for instance, create dozens of alternate universe models, some of which must seemingly be wrong, unless some new math provides a connection. At present the reiterative calculations of general relativity, which give useful correspondence to cosmic evolution over most of their values, sometimes reach a point of mathematical absurdity, where values zero out or become infinite and for which no useful physical correspondence can be imagined. (In the case of black holes, resort to quantum mechanical calculation provides amelioration and black holes were discovered to exist.) That's what the singularity is. It's just the current end of our mathematical description. Doubtless, we'll invent more. In the mean time, speculations of its import are, so to speak, somewhat groundless, particularly those partaking of a metaphysical hue.



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