Comparing presented dg and Fourier--Mukai dual cotwists #
Let L ⊣ S be a strict dg adjunction whose H⁰ presentation identifies
S with a Fourier--Mukai transform and L with a kernel-presented left
adjoint. The dg counit cone and an independently chosen enhanced kernel cone
then produce two presentations of the dual cotwist of S.
This file is the semantic left-adjunction facade for the existing twist
comparison. It swaps the two endpoint categories and correspondences, then
reuses CounitKernelConeData through the definitional conversion
LeftAdjointKernelData.toRightAdjointKernelData. It introduces neither a
second comparison record nor a second shift package. Unlike the conventional
dual twist, the dual cotwist is the unshifted counit cone.
The objectwise comparison remains noncanonical. Natural comparison data,
equivalence of H⁰ of the dg counit cone, and shift compatibility are explicit
inputs. Nothing here constructs those inputs, identifies an inverse kernel,
upgrades the dg functor to a quasi-equivalence, or asserts sphericality.
At each source object, the presented dg left-counit triangle is noncanonically isomorphic to the selected Fourier--Mukai left-counit triangle.
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The resulting noncanonical objectwise comparison from the transported dg counit cone to the selected Fourier--Mukai dual cotwist.
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Supplied natural comparison data #
Natural comparison data for the presented dg and Fourier--Mukai dual cotwists. This is the existing counit/twist comparison after swapping the two endpoints; no parallel record is introduced.
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Supply a natural dual-cotwist comparison and the two triangle-map squares not fixed by the common left-adjunction counit.
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The supplied data give a natural comparison of the two left-counit triangle families.
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The induced natural isomorphism from the transported dg counit cone to the selected Fourier--Mukai dual cotwist.
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The transported dg counit cone is a kernel functor through the supplied natural dual-cotwist comparison.
An explicit equivalence hypothesis on H⁰ of the dg counit cone transfers
to the selected Fourier--Mukai dual cotwist.
The selected dual-cotwist kernel, packaged as a kernel autoequivalence
under the explicit H⁰ equivalence hypothesis.
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Compatibility with selected shift structures #
Shift compatibility for the dg/Fourier--Mukai dual-cotwist comparison. This is a semantic alias of the existing twist package, not a second structure.
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The transported H⁰ twist shift structure used by the dual cotwist.
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Supply the selected Fourier--Mukai dual-cotwist shift structure and compatibility of the dg comparison. The result is the existing twist compatibility record viewed through the semantic facade.
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The selected shift structure on the Fourier--Mukai dual cotwist.
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The dual-cotwist comparison respects the canonical source shift package and the selected Fourier--Mukai shift package.
The selected Fourier--Mukai dual cotwist is triangulated when the comparison respects shifts and the endpoint presentation equivalence is triangulated.
The selected dual-cotwist kernel autoequivalence is exact relative to the selected target shift package.