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where \((\HFtwo_* \RP^\infty)^{\sm q}\) denotes the \(q\){\th} exterior power of \(\HFtwo_* \RP^\infty\) as a Hopf algebra~\cite[Propposition 5.5]{GoerssDieudonne}. \qed
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\end{corollary}
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\begin{remark}[{\cite[Theorems 8.5 and 8.11]{Wilson}}]
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@@ -107,7 +107,7 @@ \section{Descent and the context of a spectrum}\label{StableContextLecture}
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\end{center}
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A \index{sheaf!simplicial}quasicoherent (and Cartesian~\cite[Tag 09VK]{stacks-project}) sheaf \(\sheaf F\) over a simplicial scheme \(X\) is a sequence of quasicoherent sheaves \(\sheaf F[n]\) on \(X[n]\) as well as, for each map \(\sigma\co [m] \to [n]\) in the simplicial indexing category inducing a map \(X(\sigma)\co X[n] \to X[m]\), a natural choice of isomorphism of sheaves \[\sheaf F(\sigma)^*\co X(\sigma)^* \sheaf F[m] \to\sheaf F[n].\] In particular, a pullback \(c^* \widetilde{M}\) gives such a quasicoherent sheaf on \(\mathcal D_f\). By restricting attention to the first three levels we find exactly the structure of the descent datum described before. Additionally, we have a natural \index{Segal condition}\textit{Segal isomorphism}
\text{(cf.\ \(S \otimes_R S \otimes_R S\)} & \cong\text{\((S \otimes_R S) \otimes_S (S \otimes_R S)\) at \(n = 2\))},
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\end{align*}
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which shows that any descent datum (including those not arising, a priori, from a pullback) can be naturally extended to a full quasicoherent sheaf on \(\mathcal D_f\).
@@ -449,7 +449,7 @@ \section{The structure of \texorpdfstring{\(\moduli{fg}\)}{Mfg} I: The affine co
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to which we apply \((-) \otimes_{\Q[t]} \Q\) to calculate \[H^* \InternalHom{FormalSchemes}(B\G_a, \G_a)(\Q) = \begin{cases} \Q & \text{when \(* = 0\)}, \\\Q & \text{when \(* = 1\)}, \\ 0 & \text{otherwise}. \end{cases}\] This means that every \(2\)--cocycle is a coboundary, symmetric or not.
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\item[\(\F_p\):] Now we are computing \(\Tor\) over a free commutative \(\F_p\)--algebra on one generator with divided powers. Such an algebra splits as a tensor of truncated polynomial algebras, and again computing a minimal free resolution results in the calculation
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In the cohomology of the coordinatized deformation complex, classes of degree \(1\) biject with first-order deformations of the identity automorphism, and classes of degree \(2\) biject with first-order deformations of the formal group law \(+_\Gamma\).
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\end{lemma}
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\begin{proof}[Proof sketch]
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Throughout, we consider the square-zero extension \(R = k[\eps] / \eps^2\) with pointing \(\eps = 0\), thought of as a universal tangent vector off of a \(k\)--point.
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Throughout, consider the square-zero extension \(R = k[\eps] / \eps^2\) with pointing \(\eps = 0\), thought of as a universal tangent vector off of a \(k\)--point.
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First, we address \(1\)--cocycles. An automorphism \(\phi\) over \(R\) which reduces to the identity over \(k\) admits a series expansion
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