相当于在一元微积分中，取一个函数的不定积分，仅仅需要在结果后加一个常数。

It is the same thing as, in one variable calculus, when you take the anti-derivative of a function it is only defined up to adding the constant.

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应注意的是，任何常数的值可以加入不定积分，而不改变它的导数。

Note that any constant value may be added onto an indefinite integral without changing its derivative.

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借助相应带不定权特征值问题的第一特征值建立了其非平凡解的存在性定理，其中方程组中特征值参数小于某已知常数。

The existence of a nontrivial weak solution is established with the help of the first eigenvalue of the corresponding eigenvalue problem, where the eigenvalue parameter is less than a known constant.

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