From 072dd7451ab2ff98afaefbf74be68c904bd8fb0f Mon Sep 17 00:00:00 2001
From: Wonseok Shin <wsshin97@gmail.com>
Date: Thu, 20 Jan 2022 09:57:02 -0500
Subject: [PATCH 1/7] Define \increment as alias of Laplacian() and export it

For \increment vs. \Delta, see the discussion at
https://tex.stackexchange.com/questions/76553/correct-symbol-for-the-laplace-operator-delta.
---
 src/Extras/poetry.jl | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Extras/poetry.jl b/src/Extras/poetry.jl
index 8f22cdcb0..d352068f0 100644
--- a/src/Extras/poetry.jl
+++ b/src/Extras/poetry.jl
@@ -3,7 +3,7 @@
 #####
 
 
-export chebyshevt, chebyshevu, legendre, ∫, ⨜, ⨍, ChebyshevWeight, 𝕀, 𝕌, 𝒟
+export chebyshevt, chebyshevu, legendre, ∫, ⨜, ⨍, ChebyshevWeight, 𝕀, 𝕌, 𝒟, ∆
 
 ## Chebyshev & Legendre polynomials
 
@@ -48,4 +48,4 @@ const ℝ = Line()
 const 𝕌 = Circle()
 
 𝒟 = Derivative()
-Δ = Laplacian()
+∆ = Laplacian()

From 3635585a70680c5c3833e038b09b2db6ab60aa74 Mon Sep 17 00:00:00 2001
From: Wonseok Shin <wsshin97@gmail.com>
Date: Thu, 20 Jan 2022 11:01:23 -0500
Subject: [PATCH 2/7] Describe in comment how to enter exported unicode symbols

---
 src/Extras/poetry.jl | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/Extras/poetry.jl b/src/Extras/poetry.jl
index d352068f0..cfc507185 100644
--- a/src/Extras/poetry.jl
+++ b/src/Extras/poetry.jl
@@ -43,9 +43,9 @@ cross(∇::Function,F::Vector{M}) where {M<:MultivariateFun} = curl(F)
 
 ## Domains
 
-const 𝕀 = ChebyshevInterval()
-const ℝ = Line()
-const 𝕌 = Circle()
+const 𝕀 = ChebyshevInterval()  # \bbI<tab>
+const ℝ = Line()  # \bbR<tab>
+const 𝕌 = Circle()  # \bbU<tab>
 
-𝒟 = Derivative()
-∆ = Laplacian()
+𝒟 = Derivative()  # \scrD<tab>
+∆ = Laplacian()  # \increment<tab>, not \Delta<tab>

From da7c8abfc4ca34aa0485c7dcc46f095ebe836c08 Mon Sep 17 00:00:00 2001
From: Wonseok Shin <wsshin97@gmail.com>
Date: Thu, 20 Jan 2022 11:06:33 -0500
Subject: [PATCH 3/7] =?UTF-8?q?Export=20=E2=88=91=20(\sum)=20as=20alias=20?=
 =?UTF-8?q?for=20sum()?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/Extras/poetry.jl | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Extras/poetry.jl b/src/Extras/poetry.jl
index cfc507185..b9a4a4349 100644
--- a/src/Extras/poetry.jl
+++ b/src/Extras/poetry.jl
@@ -3,7 +3,7 @@
 #####
 
 
-export chebyshevt, chebyshevu, legendre, ∫, ⨜, ⨍, ChebyshevWeight, 𝕀, 𝕌, 𝒟, ∆
+export chebyshevt, chebyshevu, legendre, ∫, ⨜, ∑, ⨍, ChebyshevWeight, 𝕀, 𝕌, 𝒟, ∆
 
 ## Chebyshev & Legendre polynomials
 
@@ -32,7 +32,7 @@ ChebyshevWeight()=ChebyshevWeight(0)
 ∫(f::Fun)=integrate(f)
 ⨜(f::Fun)=cumsum(f)
 
-for OP in (:Σ,:∮,:⨍,:⨎)
+for OP in (:∑,:∮,:⨍,:⨎)  # ∑ entered by \sum<tab>, not \Sigma<tab>
     @eval $OP(f::Fun)=sum(f)
 end
 

From cb2977f78e632f1649671e05c9e985bbe0ee2efb Mon Sep 17 00:00:00 2001
From: Wonseok Shin <wsshin97@gmail.com>
Date: Thu, 20 Jan 2022 11:42:06 -0500
Subject: [PATCH 4/7] Add unit tests for exported symbols

---
 test/ExtrasTest.jl | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/test/ExtrasTest.jl b/test/ExtrasTest.jl
index 1f09a0727..c4cc1caf9 100644
--- a/test/ExtrasTest.jl
+++ b/test/ExtrasTest.jl
@@ -2,6 +2,12 @@ using ApproxFun, Test, DualNumbers
 import ApproxFun: eigs
 
 @testset "Extras" begin
+    @testset "Exported symbols" begin
+        f = Fun()
+        @test ∑(f)==sum(f)==0
+        @test ∆ == Laplacian()
+    end
+
     @testset "Dual numbers" begin
         @test dual(1.5,1) ∈  Segment(dual(1.0,1),dual(2.0))
 

From 75b3a4a39d297c57871950bffd98d8420052d177 Mon Sep 17 00:00:00 2001
From: Wonseok Shin <wsshin97@gmail.com>
Date: Thu, 20 Jan 2022 11:43:06 -0500
Subject: [PATCH 5/7] Add packages in [extras] to make tests succeed

---
 Project.toml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Project.toml b/Project.toml
index 00c1b6a58..95e8a3894 100644
--- a/Project.toml
+++ b/Project.toml
@@ -35,8 +35,10 @@ SpecialFunctions = "1.1, 2"
 julia = "1.6"
 
 [extras]
+DualNumbers = "fa6b7ba4-c1ee-5f82-b5fc-ecf0adba8f74"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
+SpecialFunctions = "276daf66-3868-5448-9aa4-cd146d93841b"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Test", "Random"]
+test = ["DualNumbers", "Random", "SpecialFunctions", "Test"]

From fa34125d86757ee22783ba6030da1462d4f95c0d Mon Sep 17 00:00:00 2001
From: Wonseok Shin <wsshin97@gmail.com>
Date: Thu, 20 Jan 2022 11:43:54 -0500
Subject: [PATCH 6/7] Do not import ApproxFunOrthogonalPolynomials for tests

It is already re-exported from ApproxFun by @reexport.
---
 test/NumberTypeTest.jl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/NumberTypeTest.jl b/test/NumberTypeTest.jl
index 0eb494308..b8e841ccb 100644
--- a/test/NumberTypeTest.jl
+++ b/test/NumberTypeTest.jl
@@ -1,4 +1,4 @@
-using ApproxFun, ApproxFunOrthogonalPolynomials, Test
+using ApproxFun, Test
 
 @testset "BigFloat" begin
     @testset "BigFloat constructor" begin

From 2561b303a7f908da7829f5a713c834eb5b36c6ec Mon Sep 17 00:00:00 2001
From: Wonseok Shin <wsshin97@gmail.com>
Date: Fri, 21 Jan 2022 12:21:15 -0500
Subject: [PATCH 7/7] Bump up minor version number

---
 Project.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Project.toml b/Project.toml
index 95e8a3894..e74a76c24 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "ApproxFun"
 uuid = "28f2ccd6-bb30-5033-b560-165f7b14dc2f"
-version = "0.13"
+version = "0.13.1"
 
 [deps]
 AbstractFFTs = "621f4979-c628-5d54-868e-fcf4e3e8185c"