The 0 appears centered, as it should. The infinity sign, however, is over the leftmost integral operator -- not centered. How can I get it to be centered?
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A quick fix: add manually some space, writing something like \iiint_0^{\hspace{6pt}\infty}. Anyway, are you sure you need this notation? For me, this is the first time I see something above the triple integral sign.
Maybe you've found a bug in the default Computer Modern math font package. Because if you switch to a different math font package, like txfonts or fourier, the infinity sign is centered along the top:
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And: Currently, Packt sells ebooks for $4.99 each if you buy 5 of their over 1000 ebooks. If you choose only a single one, $9.99. How about combining 3 LaTeX books with Python, gnuplot, mathplotlib, Matlab, ChatGPT or other AI books? Epub and PDF. Bundle (3 books, add more for higher discount): https://packt.link/MDH5p