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在理工科中，Formula, Equation 和 Function 这三个词有什么异同？ - 知乎 equation：等式，方程式 英英释义： An assertion that two expressions are equal, expressed by writing the two expressions separated by an equal sign; from which one is to determine a particular quantity
What is the difference between equation and formula? An equation is meant to be solved, that is, there are some unknowns A formula is meant to be evaluated, that is, you replace all variables in it with values and get the value of the formula Your example is a formula for mpg But it can become an equation if mpg and one of the other value is given and the remaining value is sought
贝塞尔函数及其性质 - 知乎 贝塞尔方程 (the Bessel differential equation)在物理学诸多领域都有非常广泛的应用，如柱坐标下波的传播，薛定谔方程的解，薄膜振动，热传导等等。下面不加证明地总结贝塞尔函数的一些性质，相关证明较为繁琐，可查看相关专著，如：《数学物理方法》—吴崇试等； 《数学物理方法》— 顾樵