Fix symbols() function

diff --git a/pypol/linear.py b/pypol/linear.py
index 749f7c3..845fac3 100644 (file)
--- a/pypol/linear.py
+++ b/pypol/linear.py
@@ -355,7 +355,7 @@ class Symbol(Expression):
 def symbols(names):
     if isinstance(names, str):
         names = names.replace(',', ' ').split()
-    return (symbol(name) for name in names)
+    return (Symbol(name) for name in names)
 
 
 @_polymorphic_operator