This paper discusses the property of the indefinite integral, indicating an error in the proof of the textbook and giving a correction.
本文指出了高等数学教科书中，不定积分的一个线性性质的条件及其证明的错误，并给出正确的证明。
The term "markup" came from the printing industry, where proofreaders marked formatting or correction codes on page proof that were then typeset.
“标记”这一术语来自印刷业，该行业的校对人员把格式代码或修正代码标在书页稿样上，然后这些稿样被送去排版。
Stet: A proof - reader's instruction meaning ignore marked correction, i . e . let It'stand as it was.
保留不变： 校对用指示，表示不需理会注着的更改； 即是保持原状。
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