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函数研究的是两个变量间的变化关系.相互关联的两个变量x和y,如果一个量随着另一个量的变化而变化,在某取值范围内,每给变量x一个确定的数值,变量y都有唯一确定的值与其对应,那么变量y是变量x的函数.在物理问题中,两个物理量间的变化规律满足函数关系的例子比比皆是,不胜枚举.如果我们能够确定两个物理量变化的函数关系式,利用数学工具来研究物理问题,有时可以避开实际意义,使物理问题的解决变得简单明了.
The function study is the relationship between the two variables. The two correlated variables x and y, if one variable changes with the other, within a certain range, give each variable x a certain value , The variable y has a uniquely determined value corresponding to it, then the variable y is a function of the variable x. There are numerous examples of the variation of the two physical quantities in the physical problem that satisfy the functional relationships, and if we can determine The relationship between the two physical changes in the function, the use of mathematical tools to study the physical problems, and sometimes can avoid the practical significance of the solution to the physical problems become simple and clear.