| import Mathlib |
| import OAI.Combinatorics.IndependentSets.Repetition.ActualGame |
| import OAI.Combinatorics.IndependentSets.Repetition.RepetitionUpper |
|
|
| namespace OAI |
|
|
| namespace IndependentSetsGames.Integration.SourceParameters |
|
|
| def rate (gap : ℚ) : ℚ := 1 - gap ^ 3 / 100000 |
|
|
| theorem rate_bounds {gap : ℚ} (hgap : 0 < gap) (hgap1 : gap ≤ 1) : |
| 0 < rate gap ∧ rate gap < 1 := by |
| have hcube : gap ^ 3 ≤ 1 := pow_le_one₀ hgap.le hgap1 |
| have hcubePos : 0 < gap ^ 3 := pow_pos hgap _ |
| constructor <;> unfold rate <;> linarith |
|
|
| theorem fourth_power_comparison {gap : ℚ} (hgap : 0 ≤ gap) (hgap1 : gap ≤ 1) : |
| 1 - (gap : ℝ) ^ 3 / 6000 ≤ (rate gap : ℝ) ^ 4 := by |
| have hg : (0 : ℝ) ≤ gap := by exact_mod_cast hgap |
| have hg1 : (gap : ℝ) ≤ 1 := by exact_mod_cast hgap1 |
| have hc : (gap : ℝ) ^ 3 ≤ 1 := pow_le_one₀ hg hg1 |
| have hc0 : 0 ≤ (gap : ℝ) ^ 3 := pow_nonneg hg _ |
| have hb := one_add_mul_le_pow (a := -(gap : ℝ) ^ 3 / 100000) |
| (by linarith : (-2 : ℝ) ≤ -(gap : ℝ) ^ 3 / 100000) 4 |
| have hr : (rate gap : ℝ) = 1 - (gap : ℝ) ^ 3 / 100000 := by |
| simp only [rate, Rat.cast_sub, Rat.cast_one, Rat.cast_div, |
| Rat.cast_pow, Rat.cast_ofNat] |
| rw [hr] |
| calc |
| _ ≤ 1 + 4 * (-(gap : ℝ) ^ 3 / 100000) := by linarith |
| _ ≤ _ := by simpa only [Nat.cast_ofNat, sub_eq_add_neg, neg_div] using hb |
|
|
| theorem four_bit_rate_comparison {gap : ℚ} |
| (hgap : 0 < gap) (hgap1 : gap ≤ 1) (n : Nat) : |
| (1 - (gap : ℝ) ^ 3 / 6000) ^ ((n : ℝ) / 4) ≤ (rate gap : ℝ) ^ n := by |
| have hg : (0 : ℝ) ≤ gap := by exact_mod_cast hgap.le |
| have hg1 : (gap : ℝ) ≤ 1 := by exact_mod_cast hgap1 |
| have hc : (gap : ℝ) ^ 3 ≤ 1 := pow_le_one₀ hg hg1 |
| have hr : (0 : ℝ) ≤ rate gap := by exact_mod_cast (rate_bounds hgap hgap1).1.le |
| calc |
| _ ≤ ((rate gap : ℝ) ^ 4) ^ ((n : ℝ) / 4) := |
| Real.rpow_le_rpow (by linarith) (fourth_power_comparison hgap.le hgap1) (by positivity) |
| _ = (rate gap : ℝ) ^ ((4 : ℝ) * ((n : ℝ) / 4)) := |
| (Real.rpow_natCast_mul hr 4 ((n : ℝ) / 4)).symm |
| _ = (rate gap : ℝ) ^ (n : ℝ) := by congr 1; ring |
| _ = _ := Real.rpow_natCast _ _ |
|
|
| theorem logTwo_sixteen : IndependentSetsGames.Foundations.Repetition.logTwo 16 = 4 := by |
| unfold IndependentSetsGames.Foundations.Repetition.logTwo |
| rw [show (16 : ℝ) = 2 ^ 4 by norm_num, Real.log_pow] |
| have hlog : Real.log 2 ≠ 0 := ne_of_gt (Real.log_pos (by norm_num : (1 : ℝ) < 2)) |
| simp [hlog] |
|
|
| theorem game_repetition_rate {Q₁ Q₂ A₁ A₂ : Type*} |
| [Fintype Q₁] [Fintype Q₂] [Fintype A₁] [Fintype A₂] |
| [Nonempty A₁] [Nonempty A₂] [DecidableEq Q₁] [DecidableEq Q₂] |
| (G : IndependentSetsGames.Foundations.Games.Game Q₁ Q₂ A₁ A₂) |
| {gap : ℚ} (hgap : 0 < gap) (hgap1 : gap ≤ 1) |
| (hcards : Fintype.card A₁ * Fintype.card A₂ = 16) |
| (hvalue : G.value ≤ 1 - (gap : ℝ)) (n : Nat) : |
| (G.repetition n).value ≤ (rate gap : ℝ) ^ n := by |
| have hg : (0 : ℝ) < gap := by exact_mod_cast hgap |
| have halphabet : IndependentSetsGames.Foundations.Repetition.logTwo |
| ((Fintype.card A₁ : ℝ) * (Fintype.card A₂ : ℝ)) ≤ 4 := by |
| rw [← Nat.cast_mul, hcards] |
| exact logTwo_sixteen.le |
| have h := IndependentSetsGames.Foundations.Repetition.holenstein_repetition_value |
| G n hvalue (by linarith) (by norm_num : (1 : ℝ) ≤ 4) halphabet |
| simp only [sub_sub_cancel] at h |
| exact h.trans (four_bit_rate_comparison hgap hgap1 n) |
|
|
| def sourceThreshold (D : Nat) (δ : ℚ) : ℚ := 4 * (D : ℚ)⁻¹ * δ ^ 2 |
|
|
| theorem sourceThreshold_pos {D : Nat} (hD : 0 < D) {δ : ℚ} (hδ : 0 < δ) : |
| 0 < sourceThreshold D δ := by |
| unfold sourceThreshold |
| positivity |
|
|
| theorem exists_repetition_length {gap δ : ℚ} (hgap : 0 < gap) (hgap1 : gap ≤ 1) |
| (hδ : 0 < δ) {D : Nat} (hD : 0 < D) : |
| ∃ u : Nat, 0 < u ∧ (rate gap) ^ u < sourceThreshold D δ := |
| IndependentSetsGames.Soundness.RepetitionUpper.exists_power_lt (rate gap) (sourceThreshold D δ) |
| (rate_bounds hgap hgap1).1.le (rate_bounds hgap hgap1).2 (sourceThreshold_pos hD hδ) |
|
|
| def repetitionLength (gap δ : ℚ) (hgap : 0 < gap) (hgap1 : gap ≤ 1) |
| (hδ : 0 < δ) (D : Nat) (hD : 0 < D) : Nat := |
| Nat.find (exists_repetition_length hgap hgap1 hδ hD) |
|
|
| theorem repetitionLength_spec (gap δ : ℚ) (hgap : 0 < gap) (hgap1 : gap ≤ 1) |
| (hδ : 0 < δ) (D : Nat) (hD : 0 < D) : |
| 0 < repetitionLength gap δ hgap hgap1 hδ D hD ∧ |
| rate gap ^ repetitionLength gap δ hgap hgap1 hδ D hD < sourceThreshold D δ := |
| Nat.find_spec (exists_repetition_length hgap hgap1 hδ hD) |
|
|
| theorem repetitionLength_real_bound (gap δ : ℚ) (hgap : 0 < gap) (hgap1 : gap ≤ 1) |
| (hδ : 0 < δ) (D : Nat) (hD : 0 < D) : |
| (rate gap : ℝ) ^ repetitionLength gap δ hgap hgap1 hδ D hD ≤ |
| 4 * (D : ℝ)⁻¹ * (δ : ℝ) ^ 2 := by |
| have h := (repetitionLength_spec gap δ hgap hgap1 hδ D hD).2.le |
| unfold sourceThreshold at h |
| have hr := (Rat.cast_le (K := ℝ)).mpr h |
| push_cast at hr |
| exact hr |
|
|
| end IndependentSetsGames.Integration.SourceParameters |
|
|
| end OAI |
|
|
