X-Git-Url: https://svn.cri.ensmp.fr/git/linpy.git/blobdiff_plain/288355579f9b2160e341e1d48910a66a0124ab04..383296fc80db17317dd385821265003c01134f50:/pypol/linear.py

diff --git a/pypol/linear.py b/pypol/linear.py
index 8f73fd3..2c71c02 100644
--- a/pypol/linear.py
+++ b/pypol/linear.py
@@ -271,7 +271,7 @@ class Expression:
                 self.constant == other.constant
 
     def __hash__(self):
-        return hash((self._coefficients, self._constant))
+        return hash((tuple(sorted(self._coefficients.items())), self._constant))
 
     def _toint(self):
         lcm = functools.reduce(lambda a, b: a*b // gcd(a, b),