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Dirac
Saralfur
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8-14-2008 6:13 AM
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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color:#ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/99cfa5c5-a690-447e-be52-fed660a0d9c5/2080EACC-E5E2-4FF1-873F-B8CE7B9E79AF/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://it.answers.yahoo.com/question/index?qid=20070324183319AA6ltC2" href="http://it.answers.yahoo.com/question/index?qid=20070324183319AA6ltC2" style="font-size: 11px;">it.answers.yahoo.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://it.answers.yahoo.com/question/index?qid=20070324183319AA6ltC2">la delta Dirac può essere pensata come la densità di un punto. Consideriamo ad es un corpo di massa M esteso in una certa regione V dello spazio 3D. Possiamo associare a ogni punto x dello spazio una quantità f(x) che rappresenti la densità del corpo. La funzione f sarà nulla al di fuori della regione V e, all’interno, assumerà valori tali che l’integrale esteso a V di f(x)dx converga a M<BR /><DIV> Se immaginiamo di restringere la rgione V senza variare la massa del corpo, la densità tenderà a infinito al tendere di V al singolo punto</DIV></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;"> </td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/2080EACC-E5E2-4FF1-873F-B8CE7B9E79AF/blog/" title="blog or email this clip"><img src="http://content7.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>
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