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== Example ==
In the given example, in the development of the expression for <math>\dot V(x)</math>, shouldn't there be a <math>\dot x</math> instead of a <math>f(x)</math> (according to the [[chain rule]])? The complete equation would be: <math>\dot V(x) = V'(x) \dot x = \mathrm{sign}(x)\cdot (-x) = -|x|<0.</math> <small><span class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[User:Guissoares|Guissoares]] ([[User talk:Guissoares|talk]] • [[Special:Contributions/Guissoares|contribs]]) 21:53, 7 January 2011 (UTC)</span></small><!-- Template:Unsigned --> <!--Autosigned by SineBot-->
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