Fix Symbol creation

diff --git a/pypol/linear.py b/pypol/linear.py
index bd7037b5ed3ae5629077c9fb117be7480544ef4c..8f73fd312ff753d5d9d53e605eae2cb582b48a6b 100644 (file)
--- a/pypol/linear.py
+++ b/pypol/linear.py
@@ -62,7 +62,7 @@ class Expression:
                 for symbol, coefficient in coefficients if coefficient != 0]
         if len(coefficients) == 0:
             return Constant(constant)
-        elif len(coefficients) == 1:
+        elif len(coefficients) == 1 and constant == 0:
             symbol, coefficient = coefficients[0]
             if coefficient == 1:
                 return Symbol(symbol)