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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