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    <a href="#subtract/2">subtract(a, b)</a>
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    <div class="summary-synopsis"><p>Subtract vector <em>B</em> from vector <em>A</em>.  Equivalent to <code class="inline">Vector.add(A, Vector.revers(B))</code></p>
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  <div class="summary-signature">
    <a href="#unit/1">unit(v)</a>
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    <div class="summary-synopsis"><p>Returns the unit vector parallel ot the given vector.
This will raise an <a href="htt