Change - into +

Thanks to Noah Olander http://stacks.math.columbia.edu/tag/00LY#comment-2334
stacks · Feb 17, 2017 · 167a011 · 167a011
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commit 167a011
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diff --git 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
@@ -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})
 \}
 }
 $$