Generally, model can be expressed by classification rule, decision tree and mathematical formula.
通常，模型可以用分类规则、判定树或数学公式表示。
Based on analyzing the structure of practicable isometric profile, the radius calculating formula of bigger arc and the mathematical model of practicable isometric-trilateral profile are reduced.
从分析实用等距曲线的构成入手，推导出了实用三弧段等距型面的大圆弧半径计算公式和型面曲线的数学模型。
This paper presents a simplified mathematical model for describing the water block mechanism and its influences, based on Darcy's formula and relative permeability curve and capillary pressure curve.
根据达西公式及相对渗透率曲线和毛管压力曲线的表示式，提出了一个描述水锁机理及其影响因素的简化的数学模型。
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