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	<title>Θεωρία Μέτρου 2009-10 (Παν. Κρήτης)</title>
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		<title>Θεωρία Μέτρου 2009-10 (Παν. Κρήτης)</title>
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		<title>ΑΝΑΚΟΙΝΩΣΗ: Τελικό διαγώνισμα</title>
		<link>http://measuretheory2009.wordpress.com/2010/01/25/%ce%b1%ce%bd%ce%b1%ce%ba%ce%bf%ce%b9%ce%bd%cf%89%cf%83%ce%b7-%cf%84%ce%b5%ce%bb%ce%b9%ce%ba%cf%8c-%ce%b4%ce%b9%ce%b1%ce%b3%cf%8e%ce%bd%ce%b9%cf%83%ce%bc%ce%b1/</link>
		<comments>http://measuretheory2009.wordpress.com/2010/01/25/%ce%b1%ce%bd%ce%b1%ce%ba%ce%bf%ce%b9%ce%bd%cf%89%cf%83%ce%b7-%cf%84%ce%b5%ce%bb%ce%b9%ce%ba%cf%8c-%ce%b4%ce%b9%ce%b1%ce%b3%cf%8e%ce%bd%ce%b9%cf%83%ce%bc%ce%b1/#comments</comments>
		<pubDate>Mon, 25 Jan 2010 07:29:24 +0000</pubDate>
		<dc:creator>Mihalis Kolountzakis</dc:creator>
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		<description><![CDATA[Θα γίνει την Τρίτη 2 Φεβ. 2010, στις 15:00 (αίθουσα Γ 104). Μπορείτε να δείτε το τελικό διαγώνισμα εδώ.<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=measuretheory2009.wordpress.com&amp;blog=9493671&amp;post=94&amp;subd=measuretheory2009&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Θα γίνει την Τρίτη 2 Φεβ. 2010, στις 15:00 (αίθουσα Γ 104).</p>
<p>Μπορείτε να δείτε το τελικό διαγώνισμα <a href="http://measuretheory2009.files.wordpress.com/2010/01/exam3.pdf" target="_blank">εδώ</a>.</p>
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		<title>20/1/2010: Διάσπαση Hahn και θεώρημα Radon-Nikodym</title>
		<link>http://measuretheory2009.wordpress.com/2010/01/25/2012010-%ce%b4%ce%b9%ce%ac%cf%83%cf%80%ce%b1%cf%83%ce%b7-hahn-%ce%ba%ce%b1%ce%b9-%ce%b8%ce%b5%cf%8e%cf%81%ce%b7%ce%bc%ce%b1-radon-nikodym/</link>
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		<pubDate>Mon, 25 Jan 2010 07:25:46 +0000</pubDate>
		<dc:creator>Mihalis Kolountzakis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

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		<description><![CDATA[Αποδείξαμε ότι για κάθε προσημασμένο μέτρο σε ένα χώρο μέτρου ο χώρος διαμερίζεται σε δύο υποσύνολα ώστε το μέτρο να είναι μη αρνητικό σε κάθε μετρήσιμο υποσύνολο του και μη θετικό σε κάθε υποσύνολο του (διάσπαση Hahn). Αυτό οδηγεί στη λεγόμενη ανάλυση Jordan: κάθε προσημασμένο μέτρο είναι διαφορά δύο θετικών μέτρων που φέρονται από δύο [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=measuretheory2009.wordpress.com&amp;blog=9493671&amp;post=90&amp;subd=measuretheory2009&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Αποδείξαμε ότι για κάθε προσημασμένο μέτρο σε ένα χώρο μέτρου <img src='http://s0.wp.com/latex.php?latex=X&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='X' title='X' class='latex' /> ο χώρος διαμερίζεται σε δύο υποσύνολα <img src='http://s0.wp.com/latex.php?latex=X+%3D+A+%5Ccap+B&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='X = A &#92;cap B' title='X = A &#92;cap B' class='latex' /> ώστε το μέτρο να είναι μη αρνητικό σε κάθε μετρήσιμο υποσύνολο του <img src='http://s0.wp.com/latex.php?latex=A&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='A' title='A' class='latex' /> και μη θετικό σε κάθε υποσύνολο του <img src='http://s0.wp.com/latex.php?latex=B&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='B' title='B' class='latex' /> (διάσπαση Hahn). Αυτό οδηγεί στη λεγόμενη ανάλυση Jordan: κάθε προσημασμένο μέτρο είναι διαφορά δύο θετικών μέτρων που φέρονται από δύο ξένα σύνολα (είναι δηλ. μεταξύ τους ιδιάζοντα).</p>
<p>Το χρησιμοποιήσαμε αυτό για να δείξουμε το θ. Radon-Nikodym: σε κάθε σ-πεπερασμένο χώρο μέτρου με δύο θετικά μέτρα <img src='http://s0.wp.com/latex.php?latex=%5Cmu%2C+%5Cnu%2C+%5Cnu+%3C%3C+%5Cmu&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='&#92;mu, &#92;nu, &#92;nu &lt;&lt; &#92;mu' title='&#92;mu, &#92;nu, &#92;nu &lt;&lt; &#92;mu' class='latex' /> (δηλ. <img src='http://s0.wp.com/latex.php?latex=%5Cmu%28A%29%3D0+%5CLongrightarrow+%5Cnu%28A%29%3D0&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='&#92;mu(A)=0 &#92;Longrightarrow &#92;nu(A)=0' title='&#92;mu(A)=0 &#92;Longrightarrow &#92;nu(A)=0' class='latex' />) υπάρχει συνάρτηση <img src='http://s0.wp.com/latex.php?latex=f%5Cge+0&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='f&#92;ge 0' title='f&#92;ge 0' class='latex' /> (&#8220;Radon-Nikodym παράγωγος&#8221; του <img src='http://s0.wp.com/latex.php?latex=%5Cnu&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='&#92;nu' title='&#92;nu' class='latex' /> ως προς <img src='http://s0.wp.com/latex.php?latex=%5Cmu&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='&#92;mu' title='&#92;mu' class='latex' />) ώστε <img src='http://s0.wp.com/latex.php?latex=%5Cnu%28A%29+%3D+%5Cint_A+f+d%5Cmu&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='&#92;nu(A) = &#92;int_A f d&#92;mu' title='&#92;nu(A) = &#92;int_A f d&#92;mu' class='latex' /> για κάθε <img src='http://s0.wp.com/latex.php?latex=A&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='A' title='A' class='latex' />. Γράφουμε σε αυτή την περίπτωση</p>
<p style="text-align:center;"><img src='http://s0.wp.com/latex.php?latex=d%5Cnu+%3D+f+d%5Cmu&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='d&#92;nu = f d&#92;mu' title='d&#92;nu = f d&#92;mu' class='latex' /> ή <img src='http://s0.wp.com/latex.php?latex=f%3D%5Cfrac%7Bd%5Cnu%7D%7Bd%5Cmu%7D&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='f=&#92;frac{d&#92;nu}{d&#92;mu}' title='f=&#92;frac{d&#92;nu}{d&#92;mu}' class='latex' /></p>
<p>για να υποδηλώσουμε το παραπάνω. Αυτό οδηγεί στην ανάλυση Lebesgue ενός μέτρου <img src='http://s0.wp.com/latex.php?latex=%5Cnu&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='&#92;nu' title='&#92;nu' class='latex' /> ως προς το μέτρο <img src='http://s0.wp.com/latex.php?latex=%5Cmu&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='&#92;mu' title='&#92;mu' class='latex' /> ως</p>
<p style="text-align:center;"><img src='http://s0.wp.com/latex.php?latex=%5Cnu+%3D+%5Cnu_1+%2B+%5Cnu_2&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='&#92;nu = &#92;nu_1 + &#92;nu_2' title='&#92;nu = &#92;nu_1 + &#92;nu_2' class='latex' /> με <img src='http://s0.wp.com/latex.php?latex=%5Cnu_1+%3C%3C+%5Cmu&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='&#92;nu_1 &lt;&lt; &#92;mu' title='&#92;nu_1 &lt;&lt; &#92;mu' class='latex' /> και <img src='http://s0.wp.com/latex.php?latex=%5Cnu_2+%5Cperp+%5Cmu&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='&#92;nu_2 &#92;perp &#92;mu' title='&#92;nu_2 &#92;perp &#92;mu' class='latex' />,</p>
<p>όπου <img src='http://s0.wp.com/latex.php?latex=%5Cnu_2+%5Cperp+%5Cmu&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='&#92;nu_2 &#92;perp &#92;mu' title='&#92;nu_2 &#92;perp &#92;mu' class='latex' /> σημαίνει ότι το μέτρο <img src='http://s0.wp.com/latex.php?latex=%5Cnu_2&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='&#92;nu_2' title='&#92;nu_2' class='latex' /> είναι ιδιάζον ως προς το <img src='http://s0.wp.com/latex.php?latex=%5Cmu&amp;bg=ffffff&amp;fg=000000&amp;s=0' alt='&#92;mu' title='&#92;mu' class='latex' />.</p>
<p>Ακολουθήσαμε το βιβλίο Royden, Real Analysis, 3ed, Κεφ. 11.</p>
<p>Λύστε τις ασκήσεις 29, 30, 31, 34, 37, 39.</p>
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			<media:title type="html">kolount</media:title>
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		<title>ΑΝΑΚΟΙΝΩΣΗ: Μάθημα</title>
		<link>http://measuretheory2009.wordpress.com/2010/01/09/%ce%b1%ce%bd%ce%b1%ce%ba%ce%bf%ce%b9%ce%bd%cf%89%cf%83%ce%b7-%ce%bc%ce%ac%ce%b8%ce%b7%ce%bc%ce%b1/</link>
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		<pubDate>Sat, 09 Jan 2010 21:20:10 +0000</pubDate>
		<dc:creator>Mihalis Kolountzakis</dc:creator>
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		<description><![CDATA[Θα γίνει ένα δίωρο μάθημα στις 20 Ιανουαρίου 2010, 9-11 στη Γ 104.<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=measuretheory2009.wordpress.com&amp;blog=9493671&amp;post=88&amp;subd=measuretheory2009&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Θα γίνει ένα δίωρο μάθημα στις 20 Ιανουαρίου 2010, 9-11 στη Γ 104.</p>
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		<title>ΑΝΑΚΟΙΝΩΣΗ: Μάθημα μετά τις γιορτές</title>
		<link>http://measuretheory2009.wordpress.com/2009/12/15/%ce%b1%ce%bd%ce%b1%ce%ba%ce%bf%ce%b9%ce%bd%cf%89%cf%83%ce%b7-%ce%bc%ce%ac%ce%b8%ce%b7%ce%bc%ce%b1-%ce%bc%ce%b5%cf%84%ce%ac-%cf%84%ce%b9%cf%82-%ce%b3%ce%b9%ce%bf%cf%81%cf%84%ce%ad%cf%82/</link>
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		<pubDate>Tue, 15 Dec 2009 09:18:21 +0000</pubDate>
		<dc:creator>Mihalis Kolountzakis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

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		<description><![CDATA[Θα γίνουν ένα ή δύο δίωρα μετά τις 18 Ιαν. 2010.<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=measuretheory2009.wordpress.com&amp;blog=9493671&amp;post=87&amp;subd=measuretheory2009&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Θα γίνουν ένα ή δύο δίωρα μετά τις 18 Ιαν. 2010.</p>
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		<slash:comments>0</slash:comments>
	
		<media:content url="http://1.gravatar.com/avatar/525ed2a1c887803c26142c5b298a4de9?s=96&#38;d=identicon&#38;r=G" medium="image">
			<media:title type="html">kolount</media:title>
		</media:content>
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		<title>15/12/09: Παραδείγματα χώρων μέτρου</title>
		<link>http://measuretheory2009.wordpress.com/2009/12/15/151209-%cf%80%ce%b1%cf%81%ce%b1%ce%b4%ce%b5%ce%af%ce%b3%ce%bc%ce%b1%cf%84%ce%b1-%cf%87%cf%8e%cf%81%cf%89%ce%bd-%ce%bc%ce%ad%cf%84%cf%81%ce%bf%cf%85/</link>
		<comments>http://measuretheory2009.wordpress.com/2009/12/15/151209-%cf%80%ce%b1%cf%81%ce%b1%ce%b4%ce%b5%ce%af%ce%b3%ce%bc%ce%b1%cf%84%ce%b1-%cf%87%cf%8e%cf%81%cf%89%ce%bd-%ce%bc%ce%ad%cf%84%cf%81%ce%bf%cf%85/#comments</comments>
		<pubDate>Tue, 15 Dec 2009 09:16:43 +0000</pubDate>
		<dc:creator>Mihalis Kolountzakis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://measuretheory2009.wordpress.com/2009/12/15/151209-%cf%80%ce%b1%cf%81%ce%b1%ce%b4%ce%b5%ce%af%ce%b3%ce%bc%ce%b1%cf%84%ce%b1-%cf%87%cf%8e%cf%81%cf%89%ce%bd-%ce%bc%ce%ad%cf%84%cf%81%ce%bf%cf%85/</guid>
		<description><![CDATA[Είδαμε σήμερα πολλά παραδείγματα χώρων μέτρου. Για παράδειγμα είδαμε πώς μπορούμε να γράψουμε μια άπειρη σειρά ως ένα ολοκλήρωμα σε κατάλληλο χώρο μέτρου (counting measure) και πώς τα θεωρήματα σύγκλισης (θ. μονότονης σύγκλισης, θ. κυριαρχημένης σύγκλισης) μεταφράζονται στη γλώσσα των σειρών. Είδαμε επίσης τη σημειακή μάζα Dirac και διάφορα παρόμοια μέτρα στο καθώς και το [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=measuretheory2009.wordpress.com&amp;blog=9493671&amp;post=86&amp;subd=measuretheory2009&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Είδαμε σήμερα πολλά παραδείγματα χώρων μέτρου. Για παράδειγμα είδαμε πώς μπορούμε να γράψουμε μια άπειρη σειρά ως ένα ολοκλήρωμα σε κατάλληλο χώρο μέτρου (counting measure) και πώς τα θεωρήματα σύγκλισης (θ. μονότονης σύγκλισης, θ. κυριαρχημένης σύγκλισης) μεταφράζονται στη γλώσσα των σειρών. Είδαμε επίσης τη σημειακή μάζα Dirac και διάφορα παρόμοια μέτρα στο <img title="{\mathbb R}^d" src="http://l.wordpress.com/latex.php?latex=%7B%5Cmathbb+R%7D%5Ed&amp;bg=ffffff&amp;fg=000000&amp;s=0" alt="{\mathbb R}^d" /> καθώς και το πώς ορίζεται ο μετασχηματισμός Fourier ενός πεπερασμένου μέτρου.</p>
<br />  <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gocomments/measuretheory2009.wordpress.com/86/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/comments/measuretheory2009.wordpress.com/86/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godelicious/measuretheory2009.wordpress.com/86/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/delicious/measuretheory2009.wordpress.com/86/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gofacebook/measuretheory2009.wordpress.com/86/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/facebook/measuretheory2009.wordpress.com/86/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gotwitter/measuretheory2009.wordpress.com/86/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/twitter/measuretheory2009.wordpress.com/86/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gostumble/measuretheory2009.wordpress.com/86/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/stumble/measuretheory2009.wordpress.com/86/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godigg/measuretheory2009.wordpress.com/86/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/digg/measuretheory2009.wordpress.com/86/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/goreddit/measuretheory2009.wordpress.com/86/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/reddit/measuretheory2009.wordpress.com/86/" /></a> <img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=measuretheory2009.wordpress.com&amp;blog=9493671&amp;post=86&amp;subd=measuretheory2009&amp;ref=&amp;feed=1" width="1" height="1" />]]></content:encoded>
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		<slash:comments>0</slash:comments>
	
		<media:content url="http://1.gravatar.com/avatar/525ed2a1c887803c26142c5b298a4de9?s=96&#38;d=identicon&#38;r=G" medium="image">
			<media:title type="html">kolount</media:title>
		</media:content>

		<media:content url="http://l.wordpress.com/latex.php?latex=%7B%5Cmathbb+R%7D%5Ed&#038;bg=ffffff&#038;fg=000000&#038;s=0" medium="image">
			<media:title type="html">{\mathbb R}^d</media:title>
		</media:content>
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		<title>ΑΝΑΚΟΙΝΩΣΗ: Όχι μάθημα Δε 14/12/09</title>
		<link>http://measuretheory2009.wordpress.com/2009/12/11/%ce%b1%ce%bd%ce%b1%ce%ba%ce%bf%ce%b9%ce%bd%cf%89%cf%83%ce%b7-%cf%8c%cf%87%ce%b9-%ce%bc%ce%ac%ce%b8%ce%b7%ce%bc%ce%b1-%ce%b4%ce%b5-141209/</link>
		<comments>http://measuretheory2009.wordpress.com/2009/12/11/%ce%b1%ce%bd%ce%b1%ce%ba%ce%bf%ce%b9%ce%bd%cf%89%cf%83%ce%b7-%cf%8c%cf%87%ce%b9-%ce%bc%ce%ac%ce%b8%ce%b7%ce%bc%ce%b1-%ce%b4%ce%b5-141209/#comments</comments>
		<pubDate>Fri, 11 Dec 2009 15:02:20 +0000</pubDate>
		<dc:creator>Mihalis Kolountzakis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://measuretheory2009.wordpress.com/?p=84</guid>
		<description><![CDATA[Τη Δευτέρα 14/12/09 δε θα γίνει μάθημα λόγω απουσίας μου. Μετά τις γιορτές όμως θα γίνουν κάποια μαθήματα. Θα ανακοινωθεί αργότερα το πότε.<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=measuretheory2009.wordpress.com&amp;blog=9493671&amp;post=84&amp;subd=measuretheory2009&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Τη Δευτέρα 14/12/09 δε θα γίνει μάθημα λόγω απουσίας μου.</p>
<p>Μετά τις γιορτές όμως θα γίνουν κάποια μαθήματα. Θα ανακοινωθεί αργότερα το πότε.</p>
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		<slash:comments>0</slash:comments>
	
		<media:content url="http://1.gravatar.com/avatar/525ed2a1c887803c26142c5b298a4de9?s=96&#38;d=identicon&#38;r=G" medium="image">
			<media:title type="html">kolount</media:title>
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		<title>11/12/09: Δεύτερο διαγώνισμα</title>
		<link>http://measuretheory2009.wordpress.com/2009/12/11/111209-%ce%b4%ce%b5%cf%8d%cf%84%ce%b5%cf%81%ce%bf-%ce%b4%ce%b9%ce%b1%ce%b3%cf%8e%ce%bd%ce%b9%cf%83%ce%bc%ce%b1/</link>
		<comments>http://measuretheory2009.wordpress.com/2009/12/11/111209-%ce%b4%ce%b5%cf%8d%cf%84%ce%b5%cf%81%ce%bf-%ce%b4%ce%b9%ce%b1%ce%b3%cf%8e%ce%bd%ce%b9%cf%83%ce%bc%ce%b1/#comments</comments>
		<pubDate>Fri, 11 Dec 2009 15:00:24 +0000</pubDate>
		<dc:creator>Mihalis Kolountzakis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://measuretheory2009.wordpress.com/?p=81</guid>
		<description><![CDATA[Σήμερα είχαμε το δεύτερο διαγώνισμα. Είναι εδώ.<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=measuretheory2009.wordpress.com&amp;blog=9493671&amp;post=81&amp;subd=measuretheory2009&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Σήμερα είχαμε το δεύτερο διαγώνισμα. Είναι <a href="http://measuretheory2009.files.wordpress.com/2009/12/exam2.pdf" target="_blank">εδώ</a>.</p>
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		<slash:comments>0</slash:comments>
	
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			<media:title type="html">kolount</media:title>
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		<title>8/12/09: Γενικοί χώροι μέτρου</title>
		<link>http://measuretheory2009.wordpress.com/2009/12/08/81209-%ce%b3%ce%b5%ce%bd%ce%b9%ce%ba%ce%bf%ce%af-%cf%87%cf%8e%cf%81%ce%bf%ce%b9-%ce%bc%ce%ad%cf%84%cf%81%ce%bf%cf%85/</link>
		<comments>http://measuretheory2009.wordpress.com/2009/12/08/81209-%ce%b3%ce%b5%ce%bd%ce%b9%ce%ba%ce%bf%ce%af-%cf%87%cf%8e%cf%81%ce%bf%ce%b9-%ce%bc%ce%ad%cf%84%cf%81%ce%bf%cf%85/#comments</comments>
		<pubDate>Tue, 08 Dec 2009 11:39:36 +0000</pubDate>
		<dc:creator>Mihalis Kolountzakis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

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		<description><![CDATA[Σήμερα αρχίσαμε τη συζήτηση για γενικούς χώρους μέτρου, τους οοίους ορίσαμε και είδαμε πώς προκύπτει ένας χώρος μέτρου από ένα εξωτερικό μέτρο ορισμένο πάνω στον χώρο. Είδαμε επίσης την ιδιότητα κανονικότητας (regularity) για τα μέτρα Borel (που δίνουν πεερασμένο μέτρο σε όλες τις μπάλες).<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=measuretheory2009.wordpress.com&amp;blog=9493671&amp;post=80&amp;subd=measuretheory2009&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Σήμερα αρχίσαμε τη συζήτηση για γενικούς χώρους μέτρου, τους οοίους ορίσαμε και είδαμε πώς προκύπτει ένας χώρος μέτρου από ένα εξωτερικό μέτρο ορισμένο πάνω στον χώρο. Είδαμε επίσης την ιδιότητα κανονικότητας (regularity) για τα μέτρα Borel (που δίνουν πεερασμένο μέτρο σε όλες τις μπάλες).</p>
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		<slash:comments>0</slash:comments>
	
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			<media:title type="html">kolount</media:title>
		</media:content>
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		<title>ΑΝΑΚΟΙΝΩΣΗ: Έκτακτο μάθημα</title>
		<link>http://measuretheory2009.wordpress.com/2009/12/07/%ce%b1%ce%bd%ce%b1%ce%ba%ce%bf%ce%b9%ce%bd%cf%89%cf%83%ce%b7-%ce%ad%ce%ba%cf%84%ce%b1%ce%ba%cf%84%ce%bf-%ce%bc%ce%ac%ce%b8%ce%b7%ce%bc%ce%b1/</link>
		<comments>http://measuretheory2009.wordpress.com/2009/12/07/%ce%b1%ce%bd%ce%b1%ce%ba%ce%bf%ce%b9%ce%bd%cf%89%cf%83%ce%b7-%ce%ad%ce%ba%cf%84%ce%b1%ce%ba%cf%84%ce%bf-%ce%bc%ce%ac%ce%b8%ce%b7%ce%bc%ce%b1/#comments</comments>
		<pubDate>Mon, 07 Dec 2009 09:26:52 +0000</pubDate>
		<dc:creator>Mihalis Kolountzakis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

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		<description><![CDATA[Θα κάνουμε ένα επιπλέον δίωρο την Πέμπτη 10/12, 9-11 το πρωί στη Λ202.<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=measuretheory2009.wordpress.com&amp;blog=9493671&amp;post=77&amp;subd=measuretheory2009&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Θα κάνουμε ένα επιπλέον δίωρο την Πέμπτη 10/12, 9-11 το πρωί στη Λ202.</p>
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			<media:title type="html">kolount</media:title>
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		<title>7/12/09: Λήμμα Vitali. Jump functions.</title>
		<link>http://measuretheory2009.wordpress.com/2009/12/07/71209-%ce%bb%ce%ae%ce%bc%ce%bc%ce%b1-vitali-jump-functions/</link>
		<comments>http://measuretheory2009.wordpress.com/2009/12/07/71209-%ce%bb%ce%ae%ce%bc%ce%bc%ce%b1-vitali-jump-functions/#comments</comments>
		<pubDate>Mon, 07 Dec 2009 09:25:23 +0000</pubDate>
		<dc:creator>Mihalis Kolountzakis</dc:creator>
				<category><![CDATA[Uncategorized]]></category>

		<guid isPermaLink="false">http://measuretheory2009.wordpress.com/?p=75</guid>
		<description><![CDATA[Είδαμε πλήρως την απόδειξη του λήμματος καλυψης του Vitali και αποδείξαμε ότι οι απολύτως συνεχείς συναρτήσεις είναι ακριβώς αυτές που γράφονται ως αόριστα ολοκληρώματα ολοκληρωσίμων συναρτήσεων. Είδαμε και τι είναι οι jump functions και δείξαμε ότι η παράγωγός τους είναι 0 σ.π.<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=measuretheory2009.wordpress.com&amp;blog=9493671&amp;post=75&amp;subd=measuretheory2009&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Είδαμε πλήρως την απόδειξη του λήμματος καλυψης του Vitali και αποδείξαμε ότι οι απολύτως συνεχείς συναρτήσεις είναι ακριβώς αυτές που γράφονται ως αόριστα ολοκληρώματα ολοκληρωσίμων συναρτήσεων. Είδαμε και τι είναι οι jump functions και δείξαμε ότι η παράγωγός τους είναι 0 σ.π.</p>
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			<media:title type="html">kolount</media:title>
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