Transporting the k-Rothberger game along a homeomorphism #
The k-Rothberger game is the g1Game played with k-covers, so the transport machinery of
PiBaseLean.Properties.P151.Defs applies verbatim once we know that being a k-cover is
invariant under a homeomorphism (preimageFamilyEquiv_isKCover').
theorem
PiBase.kRothbergerGame_isPayoff_iff
{X : Type u}
{Y : Type v}
[TopologicalSpace X]
[TopologicalSpace Y]
(φ : X ≃ₜ Y)
(b : ℕ → Set (Set Y))
:
(kRothbergerGame Y).IsPayoff b ↔ (kRothbergerGame X).IsPayoff fun (n : ℕ) => (preimageFamilyEquiv φ) (b n)
theorem
PiBase.HasWinningStrategyB.kRothbergerGame_of_homeomorph
{X : Type u}
{Y : Type v}
[TopologicalSpace X]
[TopologicalSpace Y]
(φ : X ≃ₜ Y)
(h : HasWinningStrategyB (kRothbergerGame X))
:
theorem
PiBase.HasMarkovKWinningStrategyB.kRothbergerGame_of_homeomorph
{X : Type u}
{Y : Type v}
[TopologicalSpace X]
[TopologicalSpace Y]
{k : ℕ}
(φ : X ≃ₜ Y)
(h : HasMarkovKWinningStrategyB (kRothbergerGame X) k)
: