Dear all,

I thought that the interfaces to gap, singular, maxima etc. are
considered to be unique parents. Apparently gap and singular are, but
maxima is only half ways unique:

----------------------------------------------------------------------
| Sage Version 4.0, Release Date: 2009-05-29                         |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------
sage: 1._singular_().parent() is x._singular_().parent()
True
sage: 1._gap_().parent() is x._gap_().parent()
True
sage: 1._maxima_().parent() is 2._maxima_().parent()
True
sage: 1._maxima_().parent() is x._maxima_().parent()
False
sage: quit
Exiting SAGE (CPU time 0m0.12s, Wall time 0m22.97s).
Exiting spawned Singular process.
Exiting spawned Gap process.
Exiting spawned Maxima process.
Exiting spawned Maxima process.

Is this something to worry about?

Cheers
      Simon

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