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diff --git a/js/mathjax/extensions/TeX/boldsymbol.js b/js/mathjax/extensions/TeX/boldsymbol.js
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+// @license magnet:?xt=urn:btih:8e4f440f4c65981c5bf93c76d35135ba5064d8b7dn=apache-2.0.txt Apache-2.0
+/* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+
+/*************************************************************
+ *
+ *  MathJax/extensions/TeX/boldsymbol.js
+ *  
+ *  Implements the \boldsymbol{...} command to make bold
+ *  versions of all math characters (not just variables).
+ *
+ *  ---------------------------------------------------------------------
+ *  
+ *  Copyright (c) 2009-2020 The MathJax Consortium
+ * 
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+MathJax.Extension["TeX/boldsymbol"] = {
+  version: "2.7.9"
+};
+
+MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
+  
+  var MML = MathJax.ElementJax.mml;
+  var TEX = MathJax.InputJax.TeX;
+  var TEXDEF = TEX.Definitions;
+  
+  var BOLDVARIANT = {};
+  BOLDVARIANT[MML.VARIANT.NORMAL]    = MML.VARIANT.BOLD;
+  BOLDVARIANT[MML.VARIANT.ITALIC]    = MML.VARIANT.BOLDITALIC;
+  BOLDVARIANT[MML.VARIANT.FRAKTUR]   = MML.VARIANT.BOLDFRAKTUR;
+  BOLDVARIANT[MML.VARIANT.SCRIPT]    = MML.VARIANT.BOLDSCRIPT;
+  BOLDVARIANT[MML.VARIANT.SANSSERIF] = MML.VARIANT.BOLDSANSSERIF;
+  BOLDVARIANT["-tex-caligraphic"]    = "-tex-caligraphic-bold";
+  BOLDVARIANT["-tex-oldstyle"]       = "-tex-oldstyle-bold";
+  
+  TEXDEF.Add({macros: {boldsymbol: 'Boldsymbol'}},null,true);
+  
+  TEX.Parse.Augment({
+    mmlToken: function (token) {
+      if (this.stack.env.boldsymbol) {
+        var variant = token.Get("mathvariant");
+        if (variant == null) {token.mathvariant = MML.VARIANT.BOLD}
+        else {token.mathvariant = (BOLDVARIANT[variant]||variant)}
+      }
+      return token;
+    },
+    
+    Boldsymbol: function (name) {
+      var boldsymbol = this.stack.env.boldsymbol,
+          font = this.stack.env.font;
+      this.stack.env.boldsymbol = true;
+      this.stack.env.font = null;
+      var mml = this.ParseArg(name);
+      this.stack.env.font = font;
+      this.stack.env.boldsymbol = boldsymbol;
+      this.Push(mml);
+    }
+  });
+  
+  MathJax.Hub.Startup.signal.Post("TeX boldsymbol Ready");
+
+});
+
+MathJax.Ajax.loadComplete("[MathJax]/extensions/TeX/boldsymbol.js");
+// @license-end