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符号差表示成一个微分算子的指标,见指标公式(ixldex11〕21刀u】as).【补注】令A二田厂_。A”是一个有单位元的交换环R上一个交换分次代数.令A(A)表示由一切元素1十“,+“2十…,a,任才,在这种表示式的显易乘法 (1卜a,+“:+…)(l一卜b,+b:+…)二 =l+(a,+b,)+(a:+a‘b,+bZ)+…之下...