Fix sign error

sagemath · Jul 3, 2022 · b2f9f50 · b2f9f50
1 parent c4329a7
commit b2f9f50
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/sage/algebras/clifford_algebra.py b/src/sage/algebras/clifford_algebra.py
@@ -2850,7 +2850,6 @@ def _on_basis(self, m):
         sgn = 0
 
         for i in m:
-            sgn += 1
             if FrozenBitset((i,)) in keys:
                 key_basis, key_coeff = cc[FrozenBitset((i,))].list()[0]
                 m_temp = Bitset(m)
@@ -2860,6 +2859,8 @@ def _on_basis(self, m):
                 m_temp.update(key_basis)
 
                 s = s + (-1)**(sgn % 2) * key_coeff * E.monomial(FrozenBitset(m_temp))
+
+            sgn += 1
         return s
 
     @cached_method