From 9436f93dfe1fdb7f76f475603cdc0bc1fae86646 Mon Sep 17 00:00:00 2001
From: Anton Akhmerov <anton.akhmerov@gmail.com>
Date: Mon, 14 Apr 2014 16:44:14 +0200
Subject: [PATCH] extend TODO entry about neighbors

---
 TODO | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/TODO b/TODO
index 32df53c..63b293f 100644
--- a/TODO
+++ b/TODO
@@ -1,6 +1,13 @@
 Roughly in order of importance.                                     -*-org-*-
 
-* Fix lattice.neighbors() when lattice has lower dimensionality than the space.
+* Improve lattice.neighbors()
+  to support the following cases:
+  - The lattice has lower dimensionality than the space
+  - Hoppings between sites from two separate lattices
+
+  The function should be rewritten in a more robust manner using Delaunay
+  tessellation from Scipy/QHull and a proper choice of the set of sites on
+  which to perform the tessellation.
 
 * Improve error messages by checking for ABCs
   Add a classmethod "ensure_isinstance" that takes an object at makes sure that
-- 
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