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	<title>De Rerum Natura &#187; Uncategorized</title>
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	<description>Randomness, entropy, pattern matching, maps, geometry, knots, and scientific readings</description>
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		<title>Error decomposition and groups</title>
		<link>http://www.corrada.com/blog/2007/11/25/error-decomposition-and-groups/</link>
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		<pubDate>Sun, 25 Nov 2007 23:44:17 +0000</pubDate>
		<dc:creator>Andrés</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

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		<description><![CDATA[I am reading Cucker and Zhou&#8217;s &#8220;Learning Theory: An Approximation Theory Viewpoint&#8221;. I am trying to understand the accuracy versus precision separation in Digital Elevation Models (DEMs) by looking at how the bias/variance decomposition is done. Are these two different ways of decomposing error isomorphic? Is accuracy the same as bias, precision variance? I don&#8217;t [...]]]></description>
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		<title>Newton&#8217;s 3rd Law and Sword Cutting</title>
		<link>http://www.corrada.com/blog/2007/03/31/newtons-3rd-law-and-sword-cutting/</link>
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		<pubDate>Sun, 01 Apr 2007 03:40:07 +0000</pubDate>
		<dc:creator>Andrés</dc:creator>
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		<description><![CDATA[This is my last semester teaching the Physics for Scientists and Engineers course at UMass. I&#8217;m currently covering Newton&#8217;s 3rd law in class. My training in Aikido and Iaido has given me plenty of examples of how physics applies to martial arts. One good example of this is sword cutting.
The most basic sword cut is [...]]]></description>
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