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Where you have “generator of the group of homotopy spheres” maybe you mean “generator of the group of exotic 7-spheres”?
I used precisely the words of Exotic spheres and curvature, p. 601.
But then maybe that’s shorthand from the paragraph before, so we should have “the group of diffeomorphism classes of oriented homotopy spheres in dimension 7”.
Oh, I see. All right, thanks.
added pointer to these slides:
pointed out by David C. here.
I tried to find the corresponding article. Maybe it’s this one, which I added:
But the slides speak of “joint work with C. Duran and A. Rigas” and if this goes with a joint publication, then I haven’t found it yet.
There is one joint paper
Thanks! That’s not the one corresponding to those slides, but it’s interesting. I have added the pointer here (though that list of references is too long and unstructured already)
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