The only problem is that it should be renamed "div, curl, grad, and all that", or "grad, curl, div, and all that". This would help with remembering some theorems, since there is really a progression here:<br>grad: 0-form -&gt; 1-form<br>curl: 1-form -&gt; 2-form<br>div: 2-form -&gt; 3-form<br>Along these lines, there are generalizations into n-dimensional space and differential forms.