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mvh 6.1 - Gradient fields?
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[6.1] Detecting gradient fields
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<p>...by looking for their 'swirliness' ("curl"). For each of the following sketches of a vector function of $(x,y)$, use the paddlewheel test to decide if the function could be the gradient of potential function, or not.
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<img src="0g/13.1.curl1.gif">
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<img src="0g/13.1.curl2.gif"></td>
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<img src="0g/13.1.curl3.gif"></td>

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Find one of your vector sketches from yesterday...
<ul><li>that has no swirliness.
<li>that has <i>curl</i>.
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