If exist differentiation until the nth order, so, why "no exist" integration until the nth order too? I never saw a quadruple or quintuple integral, and if exist, it's always with respect to different variables. Why not difine an integral so?(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\int\int\int f(x)dx^3[/tex]

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# N-th integral

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