Fix mistake in proof lemma in dpa.tex

Thanks to Shishir Agrawal http://stacks.math.columbia.edu/tag/07GP#comment-1331
stacks · Mar 12, 2015 · 6059377 · 6059377
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diff --git a/CONTRIBUTORS b/CONTRIBUTORS
@@ -4,6 +4,7 @@
 Kian Abolfazlian
 Dan Abramovich
 Juan Pablo Acosta Lopez
+Shishir Agrawal
 Jarod Alper
 Dima Arinkin
 Hanno Becker

diff --git a/dpa.tex b/dpa.tex
@@ -197,7 +197,7 @@ \section{Divided powers}
 \gamma_j(y)^k\gamma_k(\gamma_i(x)) \\
 & = \frac{(ki)!}{k!(i!)^k} \gamma_j(y)^k \gamma_{ki}(x) \\
 & =
-\frac{(ki)!}{k!(i!)^k} \frac{(kj)!}{k!(j!)^k} \gamma_{ik}(x) \gamma_{kj}(y)
+\frac{(ki)!}{k!(i!)^k} \frac{(kj)!}{(j!)^k} \gamma_{ik}(x) \gamma_{kj}(y)
 \end{align*}
 using (3) in the first equality, (5) for $x$ in the second, and
 (2) exactly $k$ times in the third. Using (5) for $y$ we see the