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I use Mathematica as a notebook,but there is no double integral symbol,there is also no triple integral symbol and so on If there is any way to customize a symbol

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You can access such symbols via their unicode. eg enter :222c will give you the double integral symbol. Use MakeBoxes and MakeExpression if you want to modify the typesetting system to make the symbol meaningful.

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  • $\begingroup$ it works ,but the font can not be Times New Roman. And it can’t adjust font size according to the text behind $\endgroup$ – hadesth Apr 19 '19 at 2:53

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