诱导公式是指三角函数中，利用周期性将角度比较大的三角函数，转换为角度比较小的三角函数的公式。诱导公式有六组，共54个。
依据包含度和贴近度的公理化定义，讨论了由包含度诱导的贴近度，给出了一些具体的诱导公式。
Based on the axiomatization definitions of subsethood measure and similarity measure, similarity measuer induced by subsethood measure is discussed, and some real induced formulas are given.
利用微分几何和啮合原理推导出该机构的点啮合的诱导曲率方程，给出了接触域大小的计算公式。
With the differential geometry and engagement theories, induced curvature formulas of point engagement were deduced, and the formula of the local contact areas was given.
建立了二维浅水流动的旋涡诱导速度公式，在已知旋涡场和胀量场时，由该表达式可确定流动速度场。
A formula is deduced for the velocity induced by the vortices in two-dimensional shallow water flows and it is used to correct the Biot-Savart law.
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