讨论了反例在数学理论中的特殊作用，并给出了几个在多元函数微分学教学中应用的特例。
The special role of counterexamples in mathematics theory is discussed. Several special examples used in teaching differential of multi-function are given.
提炼并归纳了“决策表问题”对应的数学计算公式——特殊的多元分段函数，并指出该类分段函数的特点。
The paper summarizes the math formula of decision-making table problem and points characteristic, which a sort of multi-items subsection function owns.
运用模糊函数方法给出系统观察面上一个更为普遍的光强分布数学表达式，并分析讨论一些特殊情况及相应的实验结果。
A general analytic expression of light intensity distribution at the observation plane is obtained by means of ambiguity function method. Some special cases are discussed and verified by experiments.
运用模糊函数方法给出系统观察面上一个更为普遍的光强分布数学表达式，并分析讨论一些特殊情况及相应的实验结果。
A general analytic expression of light intensity distribution at the observation plane is obtained by means of ambiguity function method. Some special cases are discussed and verified by experiments.
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