Fix Expression.__rsub__

[linpy.git] / pypol / linear.py

diff --git a/pypol/linear.py b/pypol/linear.py
index de6f4ca..c169049 100644 (file)
--- a/pypol/linear.py
+++ b/pypol/linear.py
@@ -158,7 +158,8 @@ class Expression:
         constant = self.constant - other.constant
         return Expression(coefficients, constant)
 
-    __rsub__ = __sub__
+    def __rsub__(self, other):
+        return -(self - other)
 
     @_polymorphic_method
     def __mul__(self, other):