I am a fourth year students that mathematics branch is interested in the subject of your article, which I'm studying that article now, but I do not understand phami Theorem 3.11 which says. d (d x ∗ y + x ∗ dy) = d 2x ∗ y + d x ∗ dy + d x ∗ d y + x ∗ d2yAnd 3.12 which theorem says thatd 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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