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D(a + b) =D(a) + D(b)

D(ab) =D(a)b + aD(b)

Dn(f) = 0

B = C[X1, . . . , X n]

D(Xi) =n

j=1 aijXj

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3

x+x2y+z2 +t3 = 0 C4 C3

C3

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xny =

P(z)

K[X1, , Xn]/(a1Xm1 +

+amXmn )

K[X,Y,Z]/(f(X)Y (X,Z))