I think it's due to https://github.com/sagemath/sage/issues/34547. That
ticket was created because with the old behavior in Sage, instance of
Octave(), Mathematica(), etc. were created when Sage started up, regardless
of the availability of the corresponding software. Once those became lazy
I don’t use them very often, bu the %mathematica and %%mathematica magics
seem to have recently disappeared. They don’t appear in the %lsmagic
output, and raise an error when one attempts to use them.
Can someone shed any light on this ?
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