I assert the following within the space of the Cartesian, within the space of the cogito and the a priori to follow.
There was nothing. But then, by virtue of that, there was the one, the subject. And from nothing, and the one, there was succession: succession as a relationship term derived one from nothing. And by virtue of succession, number. And by virtue of number, algebras, and metric spaces, and topology and … well, all systems, ultimately.