Determines the automorphism groups of zero-dimensional monomial algebras via explicit classification of homogeneous locally nilpotent derivations, extending to semigroup algebras.
auser Classics. Birkh\
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Under mild conditions on p, closed subgroups of G(R) with full residual image G(F) are conjugates of G(A) for local subrings A, surjections arise from ring homomorphisms, and the identity is the universal deformation.
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The Automorphism groups of zero-dimensional monomial algebras
Determines the automorphism groups of zero-dimensional monomial algebras via explicit classification of homogeneous locally nilpotent derivations, extending to semigroup algebras.
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Deformation rings and images of Galois representations
Under mild conditions on p, closed subgroups of G(R) with full residual image G(F) are conjugates of G(A) for local subrings A, surjections arise from ring homomorphisms, and the identity is the universal deformation.