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Exceptional isogenies and the classifying spaces of simple Lie groups. (English) Zbl 0308.55016

##### MSC:
 55R45 Homology and homotopy of $$B\mathrm{O}$$ and $$B\mathrm{U}$$; Bott periodicity 55P10 Homotopy equivalences in algebraic topology 55R35 Classifying spaces of groups and $$H$$-spaces in algebraic topology 14F99 (Co)homology theory in algebraic geometry
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