Geodesic
Homomorphisms and involutions of unramified henselian division algebras
Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 26, Tome 423 (2014), pp. 264-275 Cet article a éte moissonné depuis la source Math-Net.Ru

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Let $K$ be a henselian field with the residue field $\overline K$, and let $\mathcal A_1$, $\mathcal A_2$ be finite dimensional division unramified $K$-algebras with residue algebras $\overline{\mathcal A}_1$ and $\overline{\mathcal A}_2$. Further, let $\mathrm{Hom}_K(\mathcal A_1,\mathcal A_2)$ be the set of nonzero $K$-homomorphisms from $\mathcal A_1$ to $\mathcal A_2$. We prove that there is a natural bijection between the set of nonzero $\overline K$-homomorphisms from $\overline{\mathcal A}_1$ to $\overline{\mathcal A}_2$ and the factor set of $\mathrm{Hom}_K(\mathcal A_1,\mathcal A_2)$ under the equivalence relation: $\phi_1\sim\phi_2$ $\Leftrightarrow$ there exists $m\in1+M_{\mathcal A_2}$ such that $\phi_2=\phi_1i_m$, where $i_m$ is the inner automorphism of $\mathcal A_2$ induced by $m$. A similar result is obtained for unramified algebras with involutions. 
@article{ZNSL_2014_423_a12,
     author = {S. V. Tikhonov and V. I. Yanchevskii},
     title = {Homomorphisms and involutions of unramified henselian division algebras},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {264--275},
     year = {2014},
     volume = {423},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2014_423_a12/}
}
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S. V. Tikhonov; V. I. Yanchevskii. Homomorphisms and involutions of unramified henselian division algebras. Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 26, Tome 423 (2014), pp. 264-275. http://geodesic.mathdoc.fr/item/ZNSL_2014_423_a12/

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