Fix bug with inverse.

sagemath · Jul 26, 2021 · 5cd5b4d · 5cd5b4d
1 parent b136d70
commit 5cd5b4d
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/src/sage/data_structures/coefficient_stream.py b/src/sage/data_structures/coefficient_stream.py
@@ -596,9 +596,9 @@ def iterate_coefficients(self):
             c = self._zero
             m = min(len(self._cache), n)
             for k in range(m):
-                c += self._cache[k] * self._series[n - k]
-            for k in range(m, n):
-                c += self[v+k] * self._series[n - k]
+                c += self._cache[k] * self._series[n - v - k]
+            for k in range(v+m, v+n):
+                c += self[k] * self._series[n - k]
             yield -c * self._ainv