Hi
In my case there is a cm.coercion_map(parent(myElement), parent(0))
(line 907) namely the coercions into the modular forms ring.
These maps are then used to map both myElement and 0 to the modular
forms ring (in contrast to the (vector) space myElement.parent()).
Unfortunately the check for the special case 0 comes after this,
not before. :-(
Regards
Jonas
On 22.02.2015 16:39, Simon King wrote:
Hi Eric,
On 2015-02-22, Eric Gourgoulhon <egourgoul...@gmail.com> wrote:
Note that the function is_Integer used in sage.structure.coerce.pyx is=20
*not* the above one: it is defined in lines 134-139 and it returns True for=
is_Integer(int(0)).=20
Seriously? But when the integer zero is treated in a special way, then why
did "sum(...)" not work in the original post, while "sum(..., P.zero())"
did?
Best regards,
Simon
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