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\[\begin{align*}
a+b&=0\\ c+d&=1\end{align*}\]												 

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inline-Code mit $\$ $: $a\in \mathbb R \text{ oder auch: $a\in \mathbb R $ in einem Textabschnitt }$ 

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javascript:(function(){var b=document.getElementsByTagName("head")[0],a;a=document.createElement("script");a.type="text/x-mathjax-config";a[(window.opera?"innerHTML":"text")]='MathJax.Hub.Config({jax:["input/TeX","output/HTML-CSS"],extensions:["MathMenu.js","MathZoom.js"],TeX:{extensions:["AMSmath.js","AMSsymbols.js","noErrors.js","noUndefined.js"],Macros:{dd:"{\\\\,\\\\mathrm d}"}}});MathJax.Extension.matheboard2jax={version:"1.0",PreProcess:function(c){var a=document.body.querySelectorAll("img[src^=\'http://www.matheboard.de/latex2png/latex2png.php\']");for(var b=0;b<a.length;++b){var d=a[b];var e=document.createElement("script");e.type="math/tex";MathJax.HTML.setScript(e,d.alt.replace(/(\\[\\/?(l(atex)?a?)\\])|(<br ?\\/>)/gi,""));d.parentNode.replaceChild(e,d)}}};MathJax.Hub.Register.PreProcessor(["PreProcess",MathJax.Extension.matheboard2jax]);';b.appendChild(a);a=document.createElement("script");a.type="text/javascript";a.src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML";b.appendChild(a)})()

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d.alt.replace(/\\[\\/?latexa?\\]/g,

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d.alt.replace(/(\\[\\/?(l(atex)?a?)\\])|(<br ?\\/>)/gi,

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(function () {
  window.MathJax = {
    jax: ["input/TeX", "output/HTML-CSS"],
    extensions: ["MathMenu.js", "MathZoom.js"],
    TeX: {
      extensions: ["AMSmath.js", "AMSsymbols.js",
        "noUndefined.js", "autoload-all.js"],
      Macros: {
        dd: "{\\,\\mathrm d}"
      }
    },
    "HTML-CSS": {
      preferredFont: "STIX",
      webFont: "STIX-Web"
    },
    AuthorInit: function () {
      MathJax.Extension.matheboard2jax = {
        version: "1.0",
        PreProcess: function (element) {
          var mathNodes = element.body.querySelectorAll(
            "img[src^='http://www.matheboard.de/latex2png/latex2png.php']");
          for (var i = 0; i < mathNodes.length; ++i) {
            var mNode = mathNodes[i];
            var newEl = element.createElement("script");
            newEl.type = "math/tex";
            var tex = mNode.alt
              .replace(/\[l(atex)?a?\]/gi, "\\begin{align*}")
              .replace(/\[\/l(atex)?a?\]/gi, "\\end{align*}")
              .replace(/<br ?\/>/gi, "\\\\");
            MathJax.HTML.setScript(newEl, tex);
            mNode.parentNode.replaceChild(newEl, mNode);
          }
        }
      };
      MathJax.Hub.Register.PreProcessor(["PreProcess", 
      MathJax.Extension.matheboard2jax]);
    }
  };
  var script = document.createElement("script");
  script.type = "text/javascript";
  script.src = (window.location.protocol != "https:" ?
    "http://cdn.mathjax.org" :
    "https://c328740.ssl.cf1.rackcdn.com") +
    "/mathjax/latest/MathJax.js";
  document.getElementsByTagName("head")[0].appendChild(script);
})();