So what did I do, if not the negations x and y, but not to the extent of disregarding them as the negation of metaphysics, but negating correspondingly situation? Rbg never underestimate the power of a girl with a book poster. So instead of x and y, I have negated them, since dx and dy are in the formulas or equations before me. At that time I continued to do calculations with those formulas, I considered dx and dy as real quantities, although I had to obey some exceptional rule, and to a certain point I negate the negation, that is, I convert the differential formula to integral, and in place of dx and dy, I get real numbers x and y again; but at that time, it was not that I went back to where I started, on the contrary, I had solved the problem that common geometry and algebra might have to be squashed and unable to solve.
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