On 2016-10-17 15:10, Emmanuel Charpentier wrote:
Thank you Vincent. this is much clearer.
It seems that I have some things left to understand about the Sage class
and types hierarchies.
There is a difference between a type and a parent.
A parent is a mathematical object. It is the mathematical set that your
object belongs to.
A type is a computer-science object. It defines the implementation of
your object and the methods that it has.
Now, for CDF it turns out that there is a 1-to-1 correspondence between
type and parent. But in most cases, this is not true. For example,
elements of GF(2^2) and GF(17^3) have the same type but not the same parent.
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