I am a fourth-year students Mathematics Is interested in your article title. The article, which I am studying right now. But my point is not about theorem 3.11, which states that
d (dx * y + x * dy) = d 2x * y + dx * dy + dx * dy + x * d2y
and Theorem 3.12 which states that
d 1 (d. 2x * y + x * d 2y) = d 1d 2x * y + d 2x * d 1y + d 1x * d 2y + x * d 1d 2y.
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