Correct tame symbol formula

Thanks to Yi Shan https://stacks.math.columbia.edu/tag/0EAH#comment-6283
stacks · Jul 19, 2021 · 6c28461 · 6c28461
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diff --git a/CONTRIBUTORS b/CONTRIBUTORS
@@ -370,6 +370,7 @@ Jaakko Seppala
 Michele Serra
 Emre Sertoz
 Chung-chieh Shan
+Yi Shan
 Arpith Shanbhag
 Liran Shaul
 Che Shen

diff --git a/chow.tex b/chow.tex
@@ -795,7 +795,7 @@ \section{Tame symbols}
 setting
 $$
 \partial_A(\frac{a}{b}, \frac{c}{d}) =
-\partial_A(a, b) \partial_A(a, d)^{-1} \partial_A(b, c)^{-1} \partial_A(b, d)
+\partial_A(a, c) \partial_A(a, d)^{-1} \partial_A(b, c)^{-1} \partial_A(b, d)
 $$
 we get a well defined map $Q(A)^* \times Q(A)^* \to \kappa(\mathfrak m)^*$
 satisfying (\ref{item-bilinear}), (\ref{item-skew}), (\ref{item-1-x})