Introduced formal notations of derivative which keep the properties of derivative and their operations are easily realized on computer,A mechanization proving principle of automatic reasoning of transformations between differential equations is built.

引進保持性質的導數的形式記號怎样一直看国外A片，建立了微分方程變量間依賴關系的自動推理的機械化證明原理，從而方程間的變換（如Backlund變換等）均可機械地驗證www.人人莫人人。

The following results are obtained:(1)a derivative formal context of an information system can be induced by the notion of nominal scale and the technique of plain scaling in formal concept analysis;(2)some core notions in rough set theory such as partition,upper and lower approximations,independence,dependence and reduct can be reinterpreted in derivative formal contexts.

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formal derivative：形式導數

formal 形式的 | formal derivative 形式導數 | formal language 形式語言