The material discussed in my talk in Tokyo was mostly contained in the manuscript submitted for the proceedings of ICM-90. The present paper concerns a subject which was not mentioned in Tokyo—I would have discussed it briefly, had there been more time at the end of my talk. Then, the discussion would have been purely conjectural, but in the months after the conference I have been able to give the proof in the rank two case. I apologize for this somewhat tenuous connection between my talk and the material presented here.
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