Values of the chart substitutions `chartSubst`, `xChartSubst` and `killT` on constants and on the two variables.
ProvedTypeDensity.chartSubst_apply_generatorstype-density
The chart substitutions fix constants and act on the two variables as follows: chartSubst sends T ↦ T and X ↦ T(X + α), xChartSubst sends T ↦ TX and X ↦ T, and killT sends T ↦ 0 and X ↦ X (with constants mapped to constants).
Preamble
import Definitions.Def_TypeDensity_Basic import Definitions.Def_TypeDensity_Measure_AdicCylinders import Definitions.Def_TypeDensity_Measure_HenselProducts import Definitions.Def_TypeDensity_Surfaces_Lengths import Mathlib.FieldTheory.RatFunc.Basic import Mathlib.MeasureTheory.Measure.Haar.Unique import Mathlib.NumberTheory.ArithmeticFunction.Moebius import Mathlib.NumberTheory.Padics.PadicIntegers import Mathlib.RingTheory.IntegralClosure.IntegralRestrict import Mathlib.RingTheory.MvPowerSeries.Basic import Mathlib.RingTheory.RamificationInertia.Basic import Mathlib.Topology.Algebra.Nonarchimedean.AdicTopology import Mathlib.Topology.Algebra.MvPolynomial import Mathlib.Algebra.Group.Pi.Units import Mathlib.Order.CompletePartialOrder import Mathlib.RingTheory.Henselian import Mathlib.RingTheory.Polynomial.Resultant.Basic import Mathlib.RingTheory.RegularLocalRing.Defs import Mathlib.RingTheory.SimpleRing.Principal import Mathlib.FieldTheory.Finite.Extension import Mathlib.RingTheory.AdicCompletion.Noetherian import Mathlib.RingTheory.MvPowerSeries.Equiv import Mathlib.RingTheory.PicardGroup set_option autoImplicit false open TypeDensity
Formal statement
theorem TypeDensity.chartSubst_apply_generators (O : Type) [CommRing O] (α : O) :
(∀ c : O, chartSubst O α (MvPowerSeries.C c) = MvPowerSeries.C c) ∧
chartSubst O α (axisT O) = axisT O ∧
chartSubst O α (axisX O) = axisT O * (axisX O + MvPowerSeries.C α) ∧
(∀ c : O, xChartSubst O (MvPowerSeries.C c) = MvPowerSeries.C c) ∧
xChartSubst O (axisT O) = axisT O * axisX O ∧ xChartSubst O (axisX O) = axisT O ∧
(∀ c : O, killT O (MvPowerSeries.C c) = PowerSeries.C c) ∧ killT O (axisT O) = 0 ∧
killT O (axisX O) = PowerSeries.X := by sorrySource
TypeDensity/Surfaces/Lengths.lean#L617-L634