From 6db5362ecfb3dee872d679e4ebf20c8bb608e7d9 Mon Sep 17 00:00:00 2001
From: Alexey Stukalov <astukalov@gmail.com>
Date: Fri, 19 Nov 2021 15:58:24 +0100
Subject: [PATCH 1/2] add exp(-1) constant

useful in many situations, also -exp(-1) is the branching point of
Lambert's W_0(t) and W_{-1}(t)
---
 src/IrrationalConstants.jl | 3 ++-
 src/stats.jl               | 2 ++
 test/runtests.jl           | 3 +++
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/IrrationalConstants.jl b/src/IrrationalConstants.jl
index e9c2b27..54263e0 100644
--- a/src/IrrationalConstants.jl
+++ b/src/IrrationalConstants.jl
@@ -26,7 +26,8 @@ export
     logten,     # log(10)
     logπ,       # log(π)
     log2π,      # log(2π)
-    log4π       # log(4π)
+    log4π,      # log(4π)
+    invℯ        # 1 / ℯ
 
 include("stats.jl")
 
diff --git a/src/stats.jl b/src/stats.jl
index c221961..389dc50 100644
--- a/src/stats.jl
+++ b/src/stats.jl
@@ -28,3 +28,5 @@
 @irrational logπ    1.1447298858494001741 log(big(π))
 @irrational log2π   1.8378770664093454836 log(2 * big(π))
 @irrational log4π   2.5310242469692907930 log(4 * big(π))
+
+@irrational invℯ    0.367879441171442321595 inv(big(ℯ))
diff --git a/test/runtests.jl b/test/runtests.jl
index 0bab199..554ec86 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -40,3 +40,6 @@ end
   @test isapprox(log(4pi), log4π)
 end
 
+@testset "1/e" begin
+  @test isapprox(invℯ, exp(-1))
+end

From 4514543e7194cca8f9456009eeed33638771d424 Mon Sep 17 00:00:00 2001
From: Alexey Stukalov <astukalov@gmail.com>
Date: Thu, 30 Dec 2021 22:39:34 +0100
Subject: [PATCH 2/2] add ASCII inve alias

---
 src/IrrationalConstants.jl | 2 +-
 src/stats.jl               | 1 +
 test/runtests.jl           | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/IrrationalConstants.jl b/src/IrrationalConstants.jl
index 54263e0..c61978f 100644
--- a/src/IrrationalConstants.jl
+++ b/src/IrrationalConstants.jl
@@ -27,7 +27,7 @@ export
     logπ,       # log(π)
     log2π,      # log(2π)
     log4π,      # log(4π)
-    invℯ        # 1 / ℯ
+    invℯ, inve # 1 / ℯ
 
 include("stats.jl")
 
diff --git a/src/stats.jl b/src/stats.jl
index 389dc50..ce1dacc 100644
--- a/src/stats.jl
+++ b/src/stats.jl
@@ -30,3 +30,4 @@
 @irrational log4π   2.5310242469692907930 log(4 * big(π))
 
 @irrational invℯ    0.367879441171442321595 inv(big(ℯ))
+const inve = invℯ # ASCII alias
diff --git a/test/runtests.jl b/test/runtests.jl
index 554ec86..0ac1257 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -42,4 +42,5 @@ end
 
 @testset "1/e" begin
   @test isapprox(invℯ, exp(-1))
+  @test isapprox(inve, exp(-1))
 end