Hi there,
By mistake I asked the following command:
----------------------------------------------------------------------
| Sage Version 4.6.2, Release Date: 2011-02-25 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: parent([]) = []
Instead of parent([]) == list. As a result:
sage: type(parent)
<class
'sage.modules.vector_callable_symbolic_dense.Vector_callable_symbolic_dense'>
sage: parent(2)
BOOM !!!!
Wouldn't be better to raise an error ? Note that I can also write:
sage: cos([]) = []
Cheers,
Florent
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