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$$\frac{f(a+he_j)-f(a)}{h} =\frac{f(a_1,\dots,a_{j-1},a_j+h,a_{j+1},\dots,a_n) -f(a_1,\dots,a_{j-1},a_j,a_{j+1},\dots,a_n)} {h}$$

$B$G$"$k!#(B

$B5-9f(B $\rd$ $B$O!"(B $BB?JQ?t4X?t$N(B1$B$D$NJQ?t$K4X$9$kHyJ,(B ($BJPHyJ,(B) $B$G$"$k$3$H$r6/D4$9$k$?$a$N$b$N$G!"(B partial `d', round `d', $B$^$?$OC1$K(B `d' $B$HFI$^$l$k(B (Jacobi $B$K;O$^$k$b$N$@$=$&$G$"$k(B)$B!#(B

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