From 4d8f5b18bdb2a7f9ab5a89c3b8dbd2ac48d9421b Mon Sep 17 00:00:00 2001
From: mmatera <matera@fisica.unlp.edu.ar>
Date: Thu, 20 Jul 2023 22:03:25 -0300
Subject: [PATCH] tiny tweaks in documentation

---
 mathics/builtin/arithmetic.py                 | 26 +++++++++++++++----
 .../equality_inequality.py                    |  1 -
 mathics/eval/testing_expressions.py           |  7 -----
 3 files changed, 21 insertions(+), 13 deletions(-)

diff --git a/mathics/builtin/arithmetic.py b/mathics/builtin/arithmetic.py
index 51980d633..3ed71b068 100644
--- a/mathics/builtin/arithmetic.py
+++ b/mathics/builtin/arithmetic.py
@@ -829,7 +829,9 @@ def evaluate(self, evaluation: Evaluation):
 
 class Im(SympyFunction):
     """
-    <url>:WMA link:https://reference.wolfram.com/language/ref/Im.html</url>
+    <url>
+    :WMA link:
+    https://reference.wolfram.com/language/ref/Im.html</url>
 
     <dl>
       <dt>'Im[$z$]'
@@ -1215,7 +1217,12 @@ class Real_(Builtin):
 
 class RealAbs(Builtin):
     """
-    <url>:WMA link:https://reference.wolfram.com/language/ref/RealAbs.html</url>
+    <url>
+        :Abs (Real):
+        https://en.wikipedia.org/wiki/Absolute_value</url> (<url>
+        :WMA link:
+        https://reference.wolfram.com/language/ref/RealAbs.html
+        </url>)
 
     <dl>
       <dt>'RealAbs[$x$]'
@@ -1283,8 +1290,12 @@ def test(self, expr) -> bool:
 
 class RealSign(Builtin):
     """
-    <url>:WMA link:https://reference.wolfram.com/language/ref/RealAbs.html</url>
-
+    <url>
+        :Signum:
+        https://en.wikipedia.org/wiki/Sign_function</url> (<url>
+        :WMA link:
+        https://reference.wolfram.com/language/ref/RealSign.html
+        </url>)
     <dl>
       <dt>'RealSign[$x$]'
       <dd>returns $-1$, $0$ or $1$ depending on whether $x$ is negative,
@@ -1319,7 +1330,12 @@ def eval(self, x: Number, evaluation: Evaluation) -> Optional[Integer]:
 
 class Sign(SympyFunction):
     """
-    <url>:WMA link:https://reference.wolfram.com/language/ref/Sign.html</url>
+    <url>
+        :Sign:
+        https://en.wikipedia.org/wiki/Sign_function</url> (<url>
+        :WMA link:
+        https://reference.wolfram.com/language/ref/Sign.html
+        </url>)
 
     <dl>
       <dt>'Sign[$x$]'
diff --git a/mathics/builtin/testing_expressions/equality_inequality.py b/mathics/builtin/testing_expressions/equality_inequality.py
index d5e0ce6e5..59152e31e 100644
--- a/mathics/builtin/testing_expressions/equality_inequality.py
+++ b/mathics/builtin/testing_expressions/equality_inequality.py
@@ -69,7 +69,6 @@ def numerify_args(items, evaluation) -> list:
             n_items = []
             for item in items:
                 if not isinstance(item, Number):
-                    # TODO: use $MaxExtraPrecision insterad of hard-coded 50
                     item = eval_N(item, evaluation, SymbolMaxExtraPrecision)
                 n_items.append(item)
             items = n_items
diff --git a/mathics/eval/testing_expressions.py b/mathics/eval/testing_expressions.py
index b0783ceb9..4046d0c8c 100644
--- a/mathics/eval/testing_expressions.py
+++ b/mathics/eval/testing_expressions.py
@@ -6,13 +6,6 @@
 from mathics.core.expression import Expression
 from mathics.core.systemsymbols import SymbolDirectedInfinity
 
-# TODO: Remove me. The following function is not used anywhere
-"""
-def cmp(a, b) -> int:
-    "Returns 0 if a == b, -1 if a < b and 1 if a > b"
-    return (a > b) - (a < b)
-"""
-
 
 def do_cmp(x1, x2) -> Optional[int]: