Update src/sage/rings/polynomial/integer_valued_polynomials.py

Co-authored-by: Travis Scrimshaw <clfrngrown@aol.com>
sagemath · Feb 11, 2023 · 207a954 · 207a954
1 parent c850d4b
commit 207a954
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/sage/rings/polynomial/integer_valued_polynomials.py b/src/sage/rings/polynomial/integer_valued_polynomials.py
@@ -209,8 +209,8 @@ def product_on_basis(self, n1, n2):
         if j < i:
             j, i = i, j
 
-        return self.sum((-1)**k * i.binomial(k) * (i + j - k).binomial(i) *
-                        self.basis()[i + j - k] for k in range(i + 1))
+        R = self.base_ring()
+        return self._from_dict({i+j-k: R((-1)**k * i.binomial(k) * (i + j - k).binomial(i)) for k in range(i + 1)})
 
     def from_polynomial(self, p):
         """