From cd780240553fab9b966882076fc852dce02fd68b Mon Sep 17 00:00:00 2001
From: Vanessa McHale <vamchale@gmail.com>
Date: Sat, 18 Jan 2025 09:58:42 -0500
Subject: [PATCH] fun

---
 doc/apple-by-example.md |  4 ++--
 docs/index.html         | 18 ++++++++++++------
 src/L.x                 |  2 +-
 3 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/doc/apple-by-example.md b/doc/apple-by-example.md
index 6ecd34ec3..10537e3e5 100644
--- a/doc/apple-by-example.md
+++ b/doc/apple-by-example.md
@@ -642,10 +642,10 @@ is equivalent to
 
 Identifiers may be latin or greek characters, or a single character from the
 mathematical greek or mathematical latin unicode block, optionally followed by
-some subscript alphanumeric characters. The single-character lambda `λ` is reserved. `∫`, `𝛻`,
+some subscript alphanumeric characters. `∂` may appear at the beginning of multi-character identifiers or on its own. The single-character lambda `λ` is reserved. `∫`, `𝛻`,
 and `∇` are also identifiers but may not be followed by a subscript.
 
-Thus `pxs`, `aₙ`, `sn₁`, `𝐶`, `φs`, `𝜉`, and `𝜌₀` are valid identifiers but `𝜉s` is not.
+Thus `pxs`, `aₙ`, `sn₁`, `𝐶`, `φs`, `∂f`, `𝜉`, and `𝜌₀` are valid identifiers but `𝜉s`, `𝜉∂`, and `f∂` are parsed as application of one identifier to another.
 
 ### Vulgar Fractions
 
diff --git a/docs/index.html b/docs/index.html
index ba6f5a4b0..4ba60edaa 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -772,13 +772,16 @@ <h3 id="matrix-dimensions">Matrix Dimensions</h3>
 <h3 id="identifiers">Identifiers</h3>
 <p>Identifiers may be latin or greek characters, or a single character
 from the mathematical greek or mathematical latin unicode block,
-optionally followed by some subscript alphanumeric characters. The
-single-character lambda <code>λ</code> is reserved. <code>∫</code>,
-<code>𝛻</code>, and <code>∇</code> are also identifiers but may not be
-followed by a subscript.</p>
+optionally followed by some subscript alphanumeric characters.
+<code>∂</code> may appear at the beginning of multi-character
+identifiers or on its own. The single-character lambda <code>λ</code> is
+reserved. <code>∫</code>, <code>𝛻</code>, and <code>∇</code> are also
+identifiers but may not be followed by a subscript.</p>
 <p>Thus <code>pxs</code>, <code>aₙ</code>, <code>sn₁</code>,
-<code>𝐶</code>, <code>φs</code>, <code>𝜉</code>, and <code>𝜌₀</code> are
-valid identifiers but <code>𝜉s</code> is not.</p>
+<code>𝐶</code>, <code>φs</code>, <code>∂f</code>, <code>𝜉</code>, and
+<code>𝜌₀</code> are valid identifiers but <code>𝜉s</code>,
+<code>𝜉∂</code>, and <code>f∂</code> are parsed as application of one
+identifier to another.</p>
 <h3 id="vulgar-fractions">Vulgar Fractions</h3>
 <p>Unicode vulgar fractions are considered float literals:</p>
 <pre><code> &gt; ⅚
@@ -8443,6 +8446,7 @@ <h3 id="sample-normal-distribution">Sample Normal Distribution</h3>
                     processEnvironments: true
                 },
                 displayAlign: 'center',
+                messageStyle: 'none',
                 CommonHTML: {
                     linebreaks: {
                     automatic: true
@@ -16075,6 +16079,7 @@ <h3 id="image-processing">Image Processing</h3>
                     processEnvironments: true
                 },
                 displayAlign: 'center',
+                messageStyle: 'none',
                 CommonHTML: {
                     linebreaks: {
                     automatic: true
@@ -23758,6 +23763,7 @@ <h3 id="random-walks">Random Walks</h3>
                     processEnvironments: true
                 },
                 displayAlign: 'center',
+                messageStyle: 'none',
                 CommonHTML: {
                     linebreaks: {
                     automatic: true
diff --git a/src/L.x b/src/L.x
index e12cf584d..05361b26e 100644
--- a/src/L.x
+++ b/src/L.x
@@ -54,7 +54,7 @@ $sub = [$subscript $digitsubscript]
 @follow_char = [$letter $digit \_]
 
 -- TODO: M₂,₂ without the space
-@name = ($letter#[Λλ] @follow_char* $sub* | $mathgreek $sub* | $mathlatin $sub* | ∫ | 𝛻 | ∇) [′″‴⁗]?
+@name = ([$letter ∂]#[Λλ] @follow_char* $sub* | $mathgreek $sub* | $mathlatin $sub* | ∫ | 𝛻 | ∇) [′″‴⁗]?
 
 @exp = e\-?$digit+
 @float = ($digit+\.$digit+@exp? | $digit+@exp)