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Hi Tony,

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Here is the formula I promised.  Certainly some form of Riemann-Roch should
appear.  This might be the best.

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\noindent
{\sl Riemann-Roch-Hirzebruch:}
$$
\sum_{k=0}^n {\rm dim} \, H^k(X,E)\ \ =\ \ \int_X ch\,E \cup Todd(X)
$$


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Is there any way to get a Milnor exotic sphere up there?

What about putting up a stage in the sphere inversion?

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Blaine



































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