Fix typo in derham

Thansk to Matt Larson https://stacks.math.columbia.edu/tag/0FMJ#comment-4884
stacks · Jun 9, 2020 · 9c0377e · 9c0377e
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diff --git a/CONTRIBUTORS b/CONTRIBUTORS
@@ -184,6 +184,7 @@ Matthias Kummerer
 Manoj Kummini
 Daniel Krashen
 Oleksandr Kravets
+Matt Larson
 Brian Lawrence
 Geoffrey Lee
 Heejong Lee

diff --git a/derham.tex b/derham.tex
@@ -1600,7 +1600,7 @@ \section{de Rham cohomology of projective space}
 By the computation of the Hodge cohomology of $\mathbf{P}^n_A$ over $A$
 done in Lemma \ref{lemma-hodge-cohomology-projective-space}
 we see that the spectral sequence degenerates on the $E_1$ page.
-In this way we see that $H^i_{dR}(\mathbf{P}^n_A/A)$ is a free
+In this way we see that $H^{2i}_{dR}(\mathbf{P}^n_A/A)$ is a free
 $A$-module of rank $1$ for $0 \leq i \leq n$ and zero else.
 Observe that $c_1^{dR}(\mathcal{O}(1))^i \in H^{2i}_{dR}(\mathbf{P}^n_A/A)$
 for $i = 0, \ldots, n$ and that for $i = n$ this element is the