From 45a161f588b5f84aea973c60005b2551b79ef7b1 Mon Sep 17 00:00:00 2001
From: Pietro Monticone <38562595+pitmonticone@users.noreply.github.com>
Date: Tue, 16 Dec 2025 14:50:41 +0100
Subject: [PATCH] chore: bump to `v4.27.0-rc1`

---
 SphereEversion/ToMathlib/Topology/Misc.lean |  5 ++---
 lake-manifest.json                          | 24 ++++++++++-----------
 lakefile.toml                               |  1 +
 lean-toolchain                              |  2 +-
 4 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/SphereEversion/ToMathlib/Topology/Misc.lean b/SphereEversion/ToMathlib/Topology/Misc.lean
index b8d83093..eb742e5b 100644
--- a/SphereEversion/ToMathlib/Topology/Misc.lean
+++ b/SphereEversion/ToMathlib/Topology/Misc.lean
@@ -83,9 +83,8 @@ instance : ProperlyDiscontinuousVAdd ℤ ℝ :=
     have hSL := (hL.isLUB_sSup hL').1
     have hIL := (hL.isGLB_sInf hL').1
     apply (finite_Icc ⌈sInf L - sSup K⌉ ⌊sSup L - sInf K⌋).subset
-    intro n hn
-    simp only [mem_setOf_eq, Set.Nonempty, mem_inter_iff, mem_preimage] at hn
-    obtain ⟨x, hk, hnk : (n : ℝ) + x ∈ L⟩ := hn
+    intro n ⟨x, hk, hnk⟩
+    replace hnk : (n : ℝ) + x ∈ L := hnk
     constructor
     · rw [Int.ceil_le]
       linarith [hIL hnk, hSK hk]
diff --git a/lake-manifest.json b/lake-manifest.json
index 4d70864d..73116e3a 100644
--- a/lake-manifest.json
+++ b/lake-manifest.json
@@ -15,17 +15,17 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "2df2f0150c275ad53cb3c90f7c98ec15a56a1a67",
+   "rev": "32d24245c7a12ded17325299fd41d412022cd3fe",
    "name": "mathlib",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "master",
+   "inputRev": "v4.27.0-rc1",
    "inherited": false,
    "configFile": "lakefile.lean"},
   {"url": "https://github.com/leanprover-community/plausible",
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "160af9e8e7d4ae448f3c92edcc5b6a8522453f11",
+   "rev": "8d3713f36dda48467eb61f8c1c4db89c49a6251a",
    "name": "plausible",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
@@ -35,7 +35,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "3591c3f664ac3719c4c86e4483e21e228707bfa2",
+   "rev": "19e5f5cc9c21199be466ef99489e3acab370f079",
    "name": "LeanSearchClient",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
@@ -45,7 +45,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "e9f31324f15ead11048b1443e62c5deaddd055d2",
+   "rev": "4eb26e1a4806b200ddfe5179d0c2a0fae56c54a7",
    "name": "importGraph",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
@@ -55,17 +55,17 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "b4fb2aa5290ebf61bc5f80a5375ba642f0a49192",
+   "rev": "ef8377f31b5535430b6753a974d685b0019d0681",
    "name": "proofwidgets",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "v0.0.83",
+   "inputRev": "v0.0.84",
    "inherited": true,
    "configFile": "lakefile.lean"},
   {"url": "https://github.com/leanprover-community/aesop",
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "2f6d238744c4cb07fdc91240feaf5d4221a27931",
+   "rev": "fb12f5535c80e40119286d9575c9393562252d21",
    "name": "aesop",
    "manifestFile": "lake-manifest.json",
    "inputRev": "master",
@@ -75,7 +75,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "9312503909aa8e8bb392530145cc1677a6298574",
+   "rev": "523ec6fc8062d2f470fdc8de6f822fe89552b5e6",
    "name": "Qq",
    "manifestFile": "lake-manifest.json",
    "inputRev": "master",
@@ -85,7 +85,7 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover-community",
-   "rev": "24241822ef9d3e7f6a3bcc53ad136e12663db8f3",
+   "rev": "6254bed25866358ce4f841fa5a13b77de04ffbc8",
    "name": "batteries",
    "manifestFile": "lake-manifest.json",
    "inputRev": "main",
@@ -95,10 +95,10 @@
    "type": "git",
    "subDir": null,
    "scope": "leanprover",
-   "rev": "933fce7e893f65969714c60cdb4bd8376786044e",
+   "rev": "726b98c53e2da249c1de768fbbbb5e67bc9cef60",
    "name": "Cli",
    "manifestFile": "lake-manifest.json",
-   "inputRev": "v4.26.0",
+   "inputRev": "v4.27.0-rc1",
    "inherited": true,
    "configFile": "lakefile.toml"}],
  "name": "SphereEversion",
diff --git a/lakefile.toml b/lakefile.toml
index a81f4756..eb9d9319 100644
--- a/lakefile.toml
+++ b/lakefile.toml
@@ -11,6 +11,7 @@ linter.flexible = true
 [[require]]
 name = "mathlib"
 scope = "leanprover-community"
+rev = "v4.27.0-rc1"
 
 [[require]]
 name = "checkdecls"
diff --git a/lean-toolchain b/lean-toolchain
index 2654c20b..fb18a7f4 100644
--- a/lean-toolchain
+++ b/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:v4.26.0
\ No newline at end of file
+leanprover/lean4:v4.27.0-rc1
\ No newline at end of file