From 65be01649217ecb037fa2c77e2502481b573fc34 Mon Sep 17 00:00:00 2001
From: Gustavo Rama <gdrama@gmail.com>
Date: Thu, 11 Sep 2014 08:37:17 -0300
Subject: [PATCH] Add a hash function for the class TernaryQF.

---
 src/sage/quadratic_forms/ternary_qf.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/sage/quadratic_forms/ternary_qf.py b/src/sage/quadratic_forms/ternary_qf.py
index 6a08d00f26c..da5da5f3e5b 100644
--- a/src/sage/quadratic_forms/ternary_qf.py
+++ b/src/sage/quadratic_forms/ternary_qf.py
@@ -116,6 +116,19 @@ def coefficients(self):
         """
         return self._a, self._b, self._c, self._r, self._s, self._t
 
+    def __hash__(self):
+        """
+        Returns a hash for self.
+
+        EXAMPLES::
+
+            sage: Q = TernaryQF([1, 2, 3, 4, 5, 6])
+            sage: Q.__hash__()
+            5881802312257552497
+        """
+
+        return hash(self.coefficients())
+
     def coefficient(self, n):
         r"""
         Return the `n`-th coefficient of the ternary quadratic form.