Classical mathematical equations is the large number of second-order linear partial differential equations.
经典的数理方程大量的是二阶线性偏微分方程。
With the ordinary theory of Heat Exchange in physics this essay visualizes the essence of second-order homogenous linear partial differential equations.
本文利用物理学中常见的热传导理论，形象地阐释了二阶齐次线性偏微分方程的本质。
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