From 42d85886cb5eaf60f7ab00fd3675b78f969d1a07 Mon Sep 17 00:00:00 2001
From: Christoph Groth <christoph.groth@cea.fr>
Date: Thu, 11 Apr 2013 15:46:13 +0200
Subject: [PATCH] add TODO item

---
 TODO | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/TODO b/TODO
index bb4a3508..b8262c7e 100644
--- a/TODO
+++ b/TODO
@@ -83,3 +83,11 @@ Roughly in order of importance.                                     -*-org-*-
 * Make shape a callable that uses system symmetry.
   Similarly to HoppingKind, which requires information about sites in the
   builder to generate hoppings, shape can be made symmetry-aware.
+
+* Consider using two-way-compressed uni-directional graphs in systems
+  advantages:
+  - The number of edges gets reduced by 1/2.
+  - The Hermicity of the Hamiltonian is enforced in a more obvious way.
+  - It's clear at system level which Hamiltonian elements are defined
+    directly.
+  Would Michael's graph slicing code continue to work?
-- 
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