I want to thank you all, who have contributed to answer my questions
about co(ntra)variance. Now I will have to read it all for a few times
(I guess a dozent will enough ;-) to try to understand what you gurus
tried to tell me ;-))

When I've reached that state, I would like to post a summary to beg
your comments to see, if I reached knowledge or not. In that summary,
there may pop up further questions, if something is still not clear to
me.

It may take some days for the dozent concentrated readings, though.

Thanks again for all help.


Ciao,
Clemens.

PS: Thanks also to Mark Wotton.
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