On 2018-06-09 11:12, Volker Braun wrote:
But thats the thing about //, it is not natural wrt. embedding in a
larger ring. The whole point is that it throws away information, so you
cannot expect the diagram to commute:
sage: ZZ(1) // ZZ(2)
0
sage: QQ(1) // QQ(2)
1/2
True, I didn't know that. I would expect that both of these return 0.
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