imo.imo2020_q2 | Mathlib porting status

Changes since the initial port

The following section lists changes to this file in mathlib3 and mathlib4 that occured after the initial port. Most recent changes are shown first. Hovering over a commit will show all commits associated with the same mathlib3 commit.

Changes in mathlib3

5f25c089

(last sync)

Changes in mathlib3port

mathlib3

mathlib3port

08b081ea

bump to nightly-2024-01-07-06

mathlib commit https://github.com/leanprover-community/mathlib/commit/65a1391a0106c9204fe45bc73a039f056558cb83

7af124c5

Diff

@@ -47,7 +47,7 @@ theorem imo2020_q2 (a b c d : ℝ) (hd0 : 0 < d) (hdc : d ≤ c) (hcb : c ≤ b)
             (3 * a + 3 * b + c + 3 * d) * (c * c) +
           (3 * a + 3 * b + 3 * c + d) * (d * d) :=
       by
-      apply_rules [add_le_add] <;> refine' mul_le_mul_of_nonneg_right _ (mul_self_nonneg _) <;>
+      apply_rules [add_le_add] <;> refine' mul_le_mul_of_nonneg_right _ (hMul_self_nonneg _) <;>
         linarith
     _ <
         (a + 3 * b + 3 * c + 3 * d) * (a * a) + (3 * a + b + 3 * c + 3 * d) * (b * b) +

08b081ea

bump to nightly-2023-09-24-06

mathlib commit https://github.com/leanprover-community/mathlib/commit/ce64cd319bb6b3e82f31c2d38e79080d377be451

5655435f

Diff

@@ -3,7 +3,7 @@ Copyright (c) 2020 Joseph Myers. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Myers, Yury Kudryashov
 -/
-import Mathbin.Analysis.MeanInequalities
+import Analysis.MeanInequalities
 
 #align_import imo.imo2020_q2 from "leanprover-community/mathlib"@"08b081ea92d80e3a41f899eea36ef6d56e0f1db0"

08b081ea

bump to nightly-2023-07-20-09

mathlib commit https://github.com/leanprover-community/mathlib/commit/8ea5598db6caeddde6cb734aa179cc2408dbd345

9c56d0dd

Diff

@@ -2,14 +2,11 @@
 Copyright (c) 2020 Joseph Myers. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Myers, Yury Kudryashov
-
-! This file was ported from Lean 3 source module imo.imo2020_q2
-! leanprover-community/mathlib commit 08b081ea92d80e3a41f899eea36ef6d56e0f1db0
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.Analysis.MeanInequalities
 
+#align_import imo.imo2020_q2 from "leanprover-community/mathlib"@"08b081ea92d80e3a41f899eea36ef6d56e0f1db0"
+
 /-!
 # IMO 2020 Q2

08b081ea

bump to nightly-2023-07-17-03

mathlib commit https://github.com/leanprover-community/mathlib/commit/bf2428c9486c407ca38b5b3fb10b87dad0bc99fa

a159b65f

Diff

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Myers, Yury Kudryashov
 
 ! This file was ported from Lean 3 source module imo.imo2020_q2
-! leanprover-community/mathlib commit 5f25c089cb34db4db112556f23c50d12da81b297
+! leanprover-community/mathlib commit 08b081ea92d80e3a41f899eea36ef6d56e0f1db0
 ! Please do not edit these lines, except to modify the commit id
 ! if you have ported upstream changes.
 -/
@@ -13,6 +13,9 @@ import Mathbin.Analysis.MeanInequalities
 /-!
 # IMO 2020 Q2
 
+> THIS FILE IS SYNCHRONIZED WITH MATHLIB4.
+> Any changes to this file require a corresponding PR to mathlib4.
+
 The real numbers `a`, `b`, `c`, `d` are such that `a ≥ b ≥ c ≥ d > 0` and `a + b + c + d = 1`.
 Prove that `(a + 2b + 3c + 4d) a^a b^b c^c d^d < 1`.

5f25c089

bump to nightly-2023-06-09-07

mathlib commit https://github.com/leanprover-community/mathlib/commit/7e5137f579de09a059a5ce98f364a04e221aabf0

16afdc39

Diff

@@ -57,6 +57,5 @@ theorem imo2020_q2 (a b c d : ℝ) (hd0 : 0 < d) (hdc : d ≤ c) (hcb : c ≤ b)
       (lt_add_of_pos_right _ (by apply_rules [add_pos, mul_pos, zero_lt_one] <;> linarith))
     _ = (a + b + c + d) ^ 3 := by ring
     _ = 1 := by simp [h1]
-    
 #align imo2020_q2 imo2020_q2

5f25c089

bump to nightly-2023-06-07-01

mathlib commit https://github.com/leanprover-community/mathlib/commit/a3209ddf94136d36e5e5c624b10b2a347cc9d090

176da745

Changes in mathlib4

mathlib3

mathlib4

5f25c089

fix: remove remaining ^ fixes (#8463)

b0e957dd

Diff

@@ -31,17 +31,15 @@ theorem imo2020_q2 (a b c d : ℝ) (hd0 : 0 < d) (hdc : d ≤ c) (hcb : c ≤ b)
     (a + 2 * b + 3 * c + 4 * d) * a ^ a * b ^ b * c ^ c * d ^ d =
         (a + 2 * b + 3 * c + 4 * d) * (a ^ a * b ^ b * c ^ c * d ^ d) := by ac_rfl
     _ ≤ (a + 2 * b + 3 * c + 4 * d) * (a * a + b * b + c * c + d * d) := by gcongr; linarith
-    _ = (a + 2 * b + 3 * c + 4 * d) * (a * a) + (a + 2 * b + 3 * c + 4 * d) * (b * b)
-        + (a + 2 * b + 3 * c + 4 * d) * (c * c) + (a + 2 * b + 3 * c + 4 * d) * (d * d) := by ring
-    _ ≤ (a + 3 * b + 3 * c + 3 * d) * (a * a) + (3 * a + b + 3 * c + 3 * d) * (b * b)
-        + (3 * a + 3 * b + c + 3 * d) * (c * c) + (3 * a + 3 * b + 3 * c + d) * (d * d) := by
-        -- Porting note: after #2220 is fixed we can change all `a * a` to `a ^ 2` and automation
-        -- will work better
-        gcongr ?_ * _ + ?_ * _ + ?_ * _ + ?_ * _ <;> (try linarith) <;> apply mul_self_nonneg
-    _ < (a + 3 * b + 3 * c + 3 * d) * (a * a) + (3 * a + b + 3 * c + 3 * d) * (b * b)
-        + (3 * a + 3 * b + c + 3 * d) * (c * c) + (3 * a + 3 * b + 3 * c + d) * (d * d)
+    _ = (a + 2 * b + 3 * c + 4 * d) * a ^ 2 + (a + 2 * b + 3 * c + 4 * d) * b ^ 2
+        + (a + 2 * b + 3 * c + 4 * d) * c ^ 2 + (a + 2 * b + 3 * c + 4 * d) * d ^ 2 := by ring
+    _ ≤ (a + 3 * b + 3 * c + 3 * d) * a ^ 2 + (3 * a + b + 3 * c + 3 * d) * b ^ 2
+        + (3 * a + 3 * b + c + 3 * d) * c ^ 2 + (3 * a + 3 * b + 3 * c + d) * d ^ 2 := by
+        gcongr ?_ * _ + ?_ * _ + ?_ * _ + ?_ * _ <;> linarith
+    _ < (a + 3 * b + 3 * c + 3 * d) * a ^ 2 + (3 * a + b + 3 * c + 3 * d) * b ^ 2
+        + (3 * a + 3 * b + c + 3 * d) * c ^ 2 + (3 * a + 3 * b + 3 * c + d) * d ^ 2
         + (6 * a * b * c + 6 * a * b * d + 6 * a * c * d + 6 * b * c * d) :=
         (lt_add_of_pos_right _ (by apply_rules [add_pos, mul_pos, zero_lt_one] <;> linarith))
-    _ = HPow.hPow (a + b + c + d) 3 := by ring -- Porting note: See issue #2220
+    _ = (a + b + c + d) ^ 3 := by ring
     _ = 1 := by simp [h1]
 #align imo2020_q2 imo2020_q2

5f25c089

chore: script to replace headers with #align_import statements (#5979)

depends on: #5966

Co-authored-by: Eric Wieser <wieser.eric@gmail.com> Co-authored-by: Scott Morrison <scott.morrison@gmail.com>

89aa3a3b

Diff

@@ -2,14 +2,11 @@
 Copyright (c) 2020 Joseph Myers. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Joseph Myers, Yury Kudryashov
-
-! This file was ported from Lean 3 source module imo.imo2020_q2
-! leanprover-community/mathlib commit 5f25c089cb34db4db112556f23c50d12da81b297
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathlib.Analysis.MeanInequalities
 
+#align_import imo.imo2020_q2 from "leanprover-community/mathlib"@"5f25c089cb34db4db112556f23c50d12da81b297"
+
 /-!
 # IMO 2020 Q2

5f25c089

feat: port Probability.Moments (#5338)

This PR completes the port of the entire Probability folder to mathlib4.

9da26a02

Diff

@@ -32,27 +32,19 @@ theorem imo2020_q2 (a b c d : ℝ) (hd0 : 0 < d) (hdc : d ≤ c) (hcb : c ≤ b)
     refine' geom_mean_le_arith_mean4_weighted _ _ _ _ _ _ _ _ h1 <;> linarith
   calc
     (a + 2 * b + 3 * c + 4 * d) * a ^ a * b ^ b * c ^ c * d ^ d =
-        (a + 2 * b + 3 * c + 4 * d) * (a ^ a * b ^ b * c ^ c * d ^ d) :=
-      by ac_rfl
-    _ ≤ (a + 2 * b + 3 * c + 4 * d) * (a * a + b * b + c * c + d * d) :=
-      (mul_le_mul_of_nonneg_left hp (by linarith))
-    _ =
-        (a + 2 * b + 3 * c + 4 * d) * (a * a) + (a + 2 * b + 3 * c + 4 * d) * (b * b) +
-            (a + 2 * b + 3 * c + 4 * d) * (c * c) +
-          (a + 2 * b + 3 * c + 4 * d) * (d * d) :=
-      by simp only [mul_add]
-    _ ≤
-        (a + 3 * b + 3 * c + 3 * d) * (a * a) + (3 * a + b + 3 * c + 3 * d) * (b * b) +
-            (3 * a + 3 * b + c + 3 * d) * (c * c) +
-          (3 * a + 3 * b + 3 * c + d) * (d * d) := by
-      apply_rules [add_le_add] <;> refine' mul_le_mul_of_nonneg_right _ (mul_self_nonneg _) <;>
-        linarith
-    _ <
-        (a + 3 * b + 3 * c + 3 * d) * (a * a) + (3 * a + b + 3 * c + 3 * d) * (b * b) +
-              (3 * a + 3 * b + c + 3 * d) * (c * c) +
-            (3 * a + 3 * b + 3 * c + d) * (d * d) +
-          (6 * a * b * c + 6 * a * b * d + 6 * a * c * d + 6 * b * c * d) :=
-      (lt_add_of_pos_right _ (by apply_rules [add_pos, mul_pos, zero_lt_one] <;> linarith))
+        (a + 2 * b + 3 * c + 4 * d) * (a ^ a * b ^ b * c ^ c * d ^ d) := by ac_rfl
+    _ ≤ (a + 2 * b + 3 * c + 4 * d) * (a * a + b * b + c * c + d * d) := by gcongr; linarith
+    _ = (a + 2 * b + 3 * c + 4 * d) * (a * a) + (a + 2 * b + 3 * c + 4 * d) * (b * b)
+        + (a + 2 * b + 3 * c + 4 * d) * (c * c) + (a + 2 * b + 3 * c + 4 * d) * (d * d) := by ring
+    _ ≤ (a + 3 * b + 3 * c + 3 * d) * (a * a) + (3 * a + b + 3 * c + 3 * d) * (b * b)
+        + (3 * a + 3 * b + c + 3 * d) * (c * c) + (3 * a + 3 * b + 3 * c + d) * (d * d) := by
+        -- Porting note: after #2220 is fixed we can change all `a * a` to `a ^ 2` and automation
+        -- will work better
+        gcongr ?_ * _ + ?_ * _ + ?_ * _ + ?_ * _ <;> (try linarith) <;> apply mul_self_nonneg
+    _ < (a + 3 * b + 3 * c + 3 * d) * (a * a) + (3 * a + b + 3 * c + 3 * d) * (b * b)
+        + (3 * a + 3 * b + c + 3 * d) * (c * c) + (3 * a + 3 * b + 3 * c + d) * (d * d)
+        + (6 * a * b * c + 6 * a * b * d + 6 * a * c * d + 6 * b * c * d) :=
+        (lt_add_of_pos_right _ (by apply_rules [add_pos, mul_pos, zero_lt_one] <;> linarith))
     _ = HPow.hPow (a + b + c + d) 3 := by ring -- Porting note: See issue #2220
     _ = 1 := by simp [h1]
 #align imo2020_q2 imo2020_q2

5f25c089

feat: port Algebra.Category.BoolRingCat (#5053)

a9540a65

`imo.imo2020_q2` ⟷ `Archive.Imo.Imo2020Q2`

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 12 + 771

imo.imo2020_q2 ⟷ Archive.Imo.Imo2020Q2

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 12 + 771

`imo.imo2020_q2` ⟷ `Archive.Imo.Imo2020Q2`