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Zha Jianguo 《代数通讯》2013,41(2):695-703
Given an irreducible root system ∑, let G(F,L) denote the Cheval- ley group over a field F corresponding to a lattice L between the root lattice and the weight lattice of ∑,. We will determine all nontnvial homomorphisms from G(k,L 1) to G(K,L 2when k and K are any fields of characteristic zero, and we will verify that any nontrivial homomorphism from G(k,L 1) to G(K,L 2are induced by a field homomorphism from k to K by multiplying an automorphism of G(K,L 2. 相似文献
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