fix _automorphisms for degree 1 number field (#1585)

thofma · Aug 23, 2024 · c8604b9 · c8604b9
1 parent f88e78f
commit c8604b9
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/src/Map/automorphisms.jl b/src/Map/automorphisms.jl
@@ -26,7 +26,7 @@ end
 
 function _automorphisms(K::AbsSimpleNumField; is_abelian::Bool = false)
   if degree(K) == 1
-    return automorphism_type(K)[hom(K, K, one(K))]
+    return automorphism_type(K)[hom(K, K, gen(K))]
   end
   if Nemo.is_cyclo_type(K)
     f = get_attribute(K, :cyclo)::Int

diff --git a/test/Map/NumberField.jl b/test/Map/NumberField.jl
@@ -77,6 +77,10 @@ end
   @test fl
   fl, tau = Hecke.is_cm_field(K)
   @test fl
+
+  Qt, t = QQ["t"]
+  K, _ = number_field(t+1; cached=false)
+  @test length(automorphism_list(K)) == 1
 end
 
 @testset "parents" begin