Type syntax

  Let T<[d1, …, dn], ty> be a tensor of order n with dimensions d1, … dn

  Let DATA_m<[d1, …, dn], ty> be a tensor dataset of m dimensions

  Let F_m<[d1, …, dn], ty> be a tensor field of m dimensions

Basic operations:

  The gradient of a scalar field

	D : F_m<[], ty> -> F_,<[m], ty>

  The Hessian of a scalar field

	D o D : F_m<[], ty> -> F_,<[m,m], ty>

  The eigenvalues of a symmetric matrix

	lambda : F_m<[d,d], ty> -> F_m<[d], ty>

Patterns:

  The eigenvalues of the H

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	<div class="info">The output has ended thus:  a symmetric matrix

	lambda : F_m&lt;[d,d], ty&gt; -&gt; F_m&lt;[d], ty&gt;

Patterns:

  The eigenvalues of the H</div>
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