From 167a011e5f825a81e93e19b8f3d48d18185858d5 Mon Sep 17 00:00:00 2001
From: Aise Johan de Jong <aise.johan.de.jong@gmail.com>
Date: Thu, 16 Feb 2017 20:38:35 -0500
Subject: [PATCH] Change - into +

Thanks to Noah Olander
http://stacks.math.columbia.edu/tag/00LY#comment-2334
---
 CONTRIBUTORS | 1 +
 algebra.tex  | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index c93a43aca..5148b2ebb 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -157,6 +157,7 @@ Kien Nguyen
 Thomas Nyberg
 Masahiro Ohno
 Catherine O'Neil
+Noah Olander
 Martin Olsson
 Brian Osserman
 Maris Ozols
diff --git a/algebra.tex b/algebra.tex
index e313f3040..2d4b96dde 100644
--- a/algebra.tex
+++ b/algebra.tex
@@ -17517,10 +17517,10 @@ \section{Tor groups and flatness}
 \}}
 {
 \{
-d(a_{i + 1, 0}) - \delta(a_{i, 1}),
-d(a_{i, 1}) - \delta(a_{i-1, 2}),
+d(a_{i + 1, 0}) + \delta(a_{i, 1}),
+d(a_{i, 1}) + \delta(a_{i-1, 2}),
 \ldots,
-d(a_{1, i}) - \delta(a_{0, i + 1})
+d(a_{1, i}) + \delta(a_{0, i + 1})
 \}
 }
 $$