“…cupiens mathematicam tractare infra radices metaphysice…” Roger Bacon on Mathematical Abstraction

In some passages of the Opus maius and tertium, Roger Bacon holds that mathematical objects are immediate adequate human’s intellect: in our sensible life, intellect develops mostly around quantity itself. We comprehend quantities bodies by a perception because their forms belong to intellect, namely, an understanding truths is almost innate within us. A natural reaction these sentences deduce strong Pythagorean or Platonic influence Bacon’s theory knowledge. However, has always followed Aristotle’s view according which numbers figures have no real existence apart from substances, universal knowledge comes sensory experience as well. It appears claim first object human's original reading passage On Memory Reminiscence. this paper, we try clarify views about abstraction intellectual his Parisian questions on Physics Liber De causis, Perspectiva, maius, Communia mathematica Geometria speculativa. conclude considered mode internal structure physical world: does not mean for act separation ideal matter, but possibility intuition world itself, faculty necessary space time.