I was deeply amused to read “not a problem” being defined as follows:
It is not in any way “solvable”, at least not by means accessible to us (which in some sense defines it as “not a problem”).
From: Don’t test for exact equality of floating point numbers
Just in case you run into any non-solvable “problems” when creating topic maps.
The correct terminology for such cases is “not a problem.” 😉