ring_theory.witt_vector.domain | 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

b1d911ac

(last sync)

Changes in mathlib3port

mathlib3

mathlib3port

9240e8be

bump to nightly-2023-12-06-06

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

d09917f6

Diff

@@ -104,7 +104,7 @@ theorem verschiebung_nonzero {x : 𝕎 R} (hx : x ≠ 0) :
     ∃ n : ℕ, ∃ x' : 𝕎 R, x'.coeff 0 ≠ 0 ∧ x = (verschiebung^[n]) x' :=
   by
   have hex : ∃ k : ℕ, x.coeff k ≠ 0 := by
-    by_contra' hall
+    by_contra! hall
     apply hx
     ext i
     simp only [hall, zero_coeff]

9240e8be

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) 2022 Robert Y. Lewis. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Robert Y. Lewis
 -/
-import Mathbin.RingTheory.WittVector.Identities
+import RingTheory.WittVector.Identities
 
 #align_import ring_theory.witt_vector.domain from "leanprover-community/mathlib"@"9240e8be927a0955b9a82c6c85ef499ee3a626b8"

9240e8be

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) 2022 Robert Y. Lewis. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Robert Y. Lewis
-
-! This file was ported from Lean 3 source module ring_theory.witt_vector.domain
-! leanprover-community/mathlib commit 9240e8be927a0955b9a82c6c85ef499ee3a626b8
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.RingTheory.WittVector.Identities
 
+#align_import ring_theory.witt_vector.domain from "leanprover-community/mathlib"@"9240e8be927a0955b9a82c6c85ef499ee3a626b8"
+
 /-!
 
 # Witt vectors over a domain

9240e8be

bump to nightly-2023-06-30-03

mathlib commit https://github.com/leanprover-community/mathlib/commit/9240e8be927a0955b9a82c6c85ef499ee3a626b8

397a8f48

Diff

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Robert Y. Lewis
 
 ! This file was ported from Lean 3 source module ring_theory.witt_vector.domain
-! leanprover-community/mathlib commit b1d911acd60ab198808e853292106ee352b648ea
+! leanprover-community/mathlib commit 9240e8be927a0955b9a82c6c85ef499ee3a626b8
 ! Please do not edit these lines, except to modify the commit id
 ! if you have ported upstream changes.
 -/
@@ -14,6 +14,9 @@ import Mathbin.RingTheory.WittVector.Identities
 
 # Witt vectors over a domain
 
+> THIS FILE IS SYNCHRONIZED WITH MATHLIB4.
+> Any changes to this file require a corresponding PR to mathlib4.
+
 This file builds to the proof `witt_vector.is_domain`,
 an instance that says if `R` is an integral domain, then so is `𝕎 R`.
 It depends on the API around iterated applications

b1d911ac

bump to nightly-2023-06-28-09

mathlib commit https://github.com/leanprover-community/mathlib/commit/8b981918a93bc45a8600de608cde7944a80d92b9

45c541eb

Diff

@@ -54,6 +54,7 @@ local notation "𝕎" => WittVector p
 -/
 
 
+#print WittVector.shift /-
 -- type as `\bbW`
 /--
 `witt_vector.verschiebung` translates the entries of a Witt vector upward, inserting 0s in the gaps.
@@ -63,13 +64,17 @@ This is mainly useful as an auxiliary construction for `witt_vector.verschiebung
 def shift (x : 𝕎 R) (n : ℕ) : 𝕎 R :=
   mk' p fun i => x.coeff (n + i)
 #align witt_vector.shift WittVector.shift
+-/
 
+#print WittVector.shift_coeff /-
 theorem shift_coeff (x : 𝕎 R) (n k : ℕ) : (x.shift n).coeff k = x.coeff (n + k) :=
   rfl
 #align witt_vector.shift_coeff WittVector.shift_coeff
+-/
 
 variable [hp : Fact p.Prime] [CommRing R]
 
+#print WittVector.verschiebung_shift /-
 theorem verschiebung_shift (x : 𝕎 R) (k : ℕ) (h : ∀ i < k + 1, x.coeff i = 0) :
     verschiebung (x.shift k.succ) = x.shift k :=
   by
@@ -80,7 +85,9 @@ theorem verschiebung_shift (x : 𝕎 R) (k : ℕ) (h : ∀ i < k + 1, x.coeff i
     congr 1
     rw [Nat.add_succ, add_comm, Nat.add_succ, add_comm]
 #align witt_vector.verschiebung_shift WittVector.verschiebung_shift
+-/
 
+#print WittVector.eq_iterate_verschiebung /-
 theorem eq_iterate_verschiebung {x : 𝕎 R} {n : ℕ} (h : ∀ i < n, x.coeff i = 0) :
     x = (verschiebung^[n]) (x.shift n) :=
   by
@@ -90,7 +97,9 @@ theorem eq_iterate_verschiebung {x : 𝕎 R} {n : ℕ} (h : ∀ i < n, x.coeff i
     · exact ih fun i hi => h _ (hi.trans (Nat.lt_succ_self _))
     · exact h
 #align witt_vector.eq_iterate_verschiebung WittVector.eq_iterate_verschiebung
+-/
 
+#print WittVector.verschiebung_nonzero /-
 theorem verschiebung_nonzero {x : 𝕎 R} (hx : x ≠ 0) :
     ∃ n : ℕ, ∃ x' : 𝕎 R, x'.coeff 0 ≠ 0 ∧ x = (verschiebung^[n]) x' :=
   by
@@ -104,6 +113,7 @@ theorem verschiebung_nonzero {x : 𝕎 R} (hx : x ≠ 0) :
   refine' ⟨Nat.find_spec hex, eq_iterate_verschiebung fun i hi => not_not.mp _⟩
   exact Nat.find_min hex hi
 #align witt_vector.verschiebung_nonzero WittVector.verschiebung_nonzero
+-/
 
 /-!
 ## Witt vectors over a domain

b1d911ac

bump to nightly-2023-06-13-21

mathlib commit https://github.com/leanprover-community/mathlib/commit/9fb8964792b4237dac6200193a0d533f1b3f7423

829520ac

Diff

@@ -47,7 +47,6 @@ open Function
 
 variable {p : ℕ} {R : Type _}
 
--- mathport name: expr𝕎
 local notation "𝕎" => WittVector p
 
 /-!
@@ -71,8 +70,6 @@ theorem shift_coeff (x : 𝕎 R) (n k : ℕ) : (x.shift n).coeff k = x.coeff (n
 
 variable [hp : Fact p.Prime] [CommRing R]
 
-include hp
-
 theorem verschiebung_shift (x : 𝕎 R) (k : ℕ) (h : ∀ i < k + 1, x.coeff i = 0) :
     verschiebung (x.shift k.succ) = x.shift k :=
   by

b1d911ac

bump to nightly-2023-06-05-12

mathlib commit https://github.com/leanprover-community/mathlib/commit/13361559d66b84f80b6d5a1c4a26aa5054766725

d07076be

Diff

@@ -62,7 +62,7 @@ local notation "𝕎" => WittVector p
 This is mainly useful as an auxiliary construction for `witt_vector.verschiebung_nonzero`.
 -/
 def shift (x : 𝕎 R) (n : ℕ) : 𝕎 R :=
-  mk p fun i => x.coeff (n + i)
+  mk' p fun i => x.coeff (n + i)
 #align witt_vector.shift WittVector.shift
 
 theorem shift_coeff (x : 𝕎 R) (n k : ℕ) : (x.shift n).coeff k = x.coeff (n + k) :=

b1d911ac

bump to nightly-2023-05-28-18

mathlib commit https://github.com/leanprover-community/mathlib/commit/917c3c072e487b3cccdbfeff17e75b40e45f66cb

8d353152

Diff

@@ -39,7 +39,7 @@ the 0th component of which must be nonzero.
 
 noncomputable section
 
-open Classical
+open scoped Classical
 
 namespace WittVector

b1d911ac

bump to nightly-2023-05-28-04

mathlib commit https://github.com/leanprover-community/mathlib/commit/917c3c072e487b3cccdbfeff17e75b40e45f66cb

6797a637

Diff

@@ -89,8 +89,7 @@ theorem eq_iterate_verschiebung {x : 𝕎 R} {n : ℕ} (h : ∀ i < n, x.coeff i
   by
   induction' n with k ih
   · cases x <;> simp [shift]
-  · dsimp
-    rw [verschiebung_shift]
+  · dsimp; rw [verschiebung_shift]
     · exact ih fun i hi => h _ (hi.trans (Nat.lt_succ_self _))
     · exact h
 #align witt_vector.eq_iterate_verschiebung WittVector.eq_iterate_verschiebung

b1d911ac

bump to nightly-2023-02-21-16

mathlib commit https://github.com/leanprover-community/mathlib/commit/bd9851ca476957ea4549eb19b40e7b5ade9428cc

1107b979

Changes in mathlib4

mathlib3

mathlib4

b1d911ac

chore: rename by_contra' to by_contra! (#8797)

To fit with the "please try harder" convention of ! tactics.

Co-authored-by: Scott Morrison <scott.morrison@gmail.com>

738b1a97

Diff

@@ -88,7 +88,7 @@ theorem eq_iterate_verschiebung {x : 𝕎 R} {n : ℕ} (h : ∀ i < n, x.coeff i
 theorem verschiebung_nonzero {x : 𝕎 R} (hx : x ≠ 0) :
     ∃ n : ℕ, ∃ x' : 𝕎 R, x'.coeff 0 ≠ 0 ∧ x = verschiebung^[n] x' := by
   have hex : ∃ k : ℕ, x.coeff k ≠ 0 := by
-    by_contra' hall
+    by_contra! hall
     apply hx
     ext i
     simp only [hall, zero_coeff]

b1d911ac

chore: banish Type _ and Sort _ (#6499)

We remove all possible occurences of Type _ and Sort _ in favor of Type* and Sort*.

This has nice performance benefits.

32de3f67

Diff

@@ -42,7 +42,7 @@ namespace WittVector
 
 open Function
 
-variable {p : ℕ} {R : Type _}
+variable {p : ℕ} {R : Type*}
 
 local notation "𝕎" => WittVector p -- type as `\bbW`

b1d911ac

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) 2022 Robert Y. Lewis. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Robert Y. Lewis
-
-! This file was ported from Lean 3 source module ring_theory.witt_vector.domain
-! leanprover-community/mathlib commit b1d911acd60ab198808e853292106ee352b648ea
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathlib.RingTheory.WittVector.Identities
 
+#align_import ring_theory.witt_vector.domain from "leanprover-community/mathlib"@"b1d911acd60ab198808e853292106ee352b648ea"
+
 /-!
 
 # Witt vectors over a domain

b1d911ac

fix precedence of Nat.iterate (#5589)

bd2fff86

Diff

@@ -80,7 +80,7 @@ theorem verschiebung_shift (x : 𝕎 R) (k : ℕ) (h : ∀ i < k + 1, x.coeff i
 #align witt_vector.verschiebung_shift WittVector.verschiebung_shift
 
 theorem eq_iterate_verschiebung {x : 𝕎 R} {n : ℕ} (h : ∀ i < n, x.coeff i = 0) :
-    x = (verschiebung^[n]) (x.shift n) := by
+    x = verschiebung^[n] (x.shift n) := by
   induction' n with k ih
   · cases x; simp [shift]
   · dsimp; rw [verschiebung_shift]
@@ -89,7 +89,7 @@ theorem eq_iterate_verschiebung {x : 𝕎 R} {n : ℕ} (h : ∀ i < n, x.coeff i
 #align witt_vector.eq_iterate_verschiebung WittVector.eq_iterate_verschiebung
 
 theorem verschiebung_nonzero {x : 𝕎 R} (hx : x ≠ 0) :
-    ∃ n : ℕ, ∃ x' : 𝕎 R, x'.coeff 0 ≠ 0 ∧ x = (verschiebung^[n]) x' := by
+    ∃ n : ℕ, ∃ x' : 𝕎 R, x'.coeff 0 ≠ 0 ∧ x = verschiebung^[n] x' := by
   have hex : ∃ k : ℕ, x.coeff k ≠ 0 := by
     by_contra' hall
     apply hx

b1d911ac

feat: port RingTheory.WittVector.Domain (#5533)

18d8f3dc

`ring_theory.witt_vector.domain` ⟷ `Mathlib.RingTheory.WittVector.Domain`

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 10 + 681

ring_theory.witt_vector.domain ⟷ Mathlib.RingTheory.WittVector.Domain

Changes since the initial port

Changes in mathlib3

Changes in mathlib3port

Changes in mathlib4

Dependencies 10 + 681

`ring_theory.witt_vector.domain` ⟷ `Mathlib.RingTheory.WittVector.Domain`