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The geometry of filtrations

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arxiv 1907.13562 v2 pith:3K7O7FKB submitted 2019-07-31 math.AT math.AG

classification math.ATmath.AG
keywords flatgeometrymathbbquasi-coherentsheavesactionaffinealgebraic
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abstract

We display a symmetric monoidal equivalence between the stable $\infty$-category of filtered spectra, and quasi-coherent sheaves on $\mathbb{A}^1 / \mathbb{G}_m$, the quotient in the setting of spectral algebraic geometry, of the flat affine line by the canonical action of the flat multiplicative group scheme. Via a Tannaka duality argument, we identify the underlying spectrum and associated graded functors with pull-backs of quasi-coherent sheaves along certain morphisms of stacks.

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