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Bounded reduction for Chevalley groups of types $E_6$ and $E_7$
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abstract
We prove that an element from the Chevalley group of type $E_6$ or $E_7$ over a polynomial ring with coefficients in a small-dimensional ring can be reduced to an element of certain proper subsystem subgroup by a bounded number of elementary root elements. The bound is given explicitly. This result is an effective version of the early stabilisation of the corresponding $K_1$-functor. We also give part of the proof of similar hypothesis for $E_8$.
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