src/sage/dynamics/arithmetic_dynamics/projective_ds.py: Replace a use…

… of is_MPolynomialRing
sagemath · Jul 22, 2024 · 6a16461 · 6a16461
1 parent a8d9b03
commit 6a16461
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/sage/dynamics/arithmetic_dynamics/projective_ds.py b/src/sage/dynamics/arithmetic_dynamics/projective_ds.py
@@ -8473,7 +8473,7 @@ def normal_form(self, return_conjugation=False):
         #we find one and not go all the way to the splitting field
         i = 0
         if G.degree() != 0:
-            if is_MPolynomialRing(G.parent()):
+            if isinstance(G.parent(), MPolynomialRing_base):
                 G = G.polynomial(G.variable(0))
         else:
             #no other fixed points