Hello Axel,
I have followed your advice : I removed the \usepackage[utf8]{inputenc} line
and changed unicode into unicode-math in the \usepackage{fontspec,unicode}
line. I no longer have the error message mentionning \sups being already
defined, the formula is composed OK but it is displayed with what looks like
Computer Modern font, instead of the expected Chalboard SE for roman characters
and Euler for math symbols.
Yves
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