On 2018-06-12 17:24, John Cremona wrote:
OK, but having an easy way to produce the above maps would be very
helpful.
Sure. They just wouldn't be *coercion* maps. Coercion maps should be
used with care, since they are used automatically. For example, as a
consequence of the bug in my previous post, we get:
sage: QQ['x,y']("x") + QQ['y,x']("x")
2*x
sage: QQbar['x,y']("x") + QQbar['y,x']("x")
x + y
I would like to propose that both of the above become errors (since
there is no obvious candidate for the parent of the result).
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