}',
        by: '\\mathbf{y}',
        bz: '\\mathbf{z}',
        bsigma: '\\mathbf{\\sigma}',
        sign: '\\operatorname{sign}',
        diag: '\\operatorname{diag}',
        real: '\\mathbb{R}',
      },
      equationNumbers: { autoNumber: 'AMS' }
      }
    });
  </script>
  <script src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML" xml:space="preserve" type="text/javascript"></script>
  <!-- Google Custom Search -->
  <script xml:space="preserve">
    (function() {
