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<title>quesito</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>a diverso da zero, divisore dello zero, se
esiste c diverso da zero tale che ac=0.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Se l’equazione non ha soluzione non
c’č niente da dimostrare;se esiste almeno una soluzione t (at=b) anche
t+c č soluzione, essendo a(t+c)=at+ac=b. cvd<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>NOTA: Molti docenti che adesso non sanno
risolvere simili problemi sono quelli che hanno conseguito la laurea con i
docenti che adesso li denigrano e che per di pių li abilitano all’insegnamento.Saluti
Prof. Mario Nocera<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>Da:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
cabrinews-bounces@liste.keynes.scuole.bo.it
[mailto:cabrinews-bounces@liste.keynes.scuole.bo.it] <b><span style='font-weight:
bold'>Per conto di </span></b>Domenico Lenzi<br>
<b><span style='font-weight:bold'>Inviato:</span></b> martedė 16 gennaio 2007
15.24<br>
<b><span style='font-weight:bold'>A:</span></b> Lista di discussione sul
software matematico<br>
<b><span style='font-weight:bold'>Oggetto:</span></b> Re: [Cabrinews] quesito </span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Si tratta di un esercizio che un tempo (anni '60) riusciva a
risolvere anche uno studente di scuola media che avesse un professore di
matematica laureato in matematica (allora ce n'erano!) e alle
elementari avesse fatto bene i primi rudimenti di matematica moderna (il
che spesso accadeva), molto pių facili da affrontare degli
esercizi sulle frazioni a pių piani.</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Cordiali saluti.</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Domenico Lenzi</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>P.S. Insegno, tra l'altro, presso la classe di matematica e
scienze della SSIS pugliese. In 5 anni (o forse 6?)</span></font> <font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>su oltre 150
studenti o avuto soltanto due laureati in matematica: mala tempora currunt!</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>----- Original Message ----- <o:p></o:p></span></font></p>
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<div style='font-color:black'>
<p class=MsoNormal style='background:#E4E4E4'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:casarsa.f@libero.it" title="casarsa.f@libero.it">franco casarsa</a>
<o:p></o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>To:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:cabrinews@liste.keynes.scuole.bo.it"
title="cabrinews@liste.keynes.scuole.bo.it">cabrinews@liste.keynes.scuole.bo.it</a>
<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Sent:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> Monday, January
15, 2007 4:51 PM<o:p></o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Subject:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> [Cabrinews]
quesito<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>R č un anello ed a un divisore dello <st1:metricconverter
ProductID="0 in" w:st="on">0 in</st1:metricconverter> R.<br>
Mostrare che per ogni b in R l'equazione ax = b <br>
o non ha soluzioni o ne ha pių d'una.<br>
<font color=red><span style='color:red'>Esercizio E3 a pg. 121 del
Childs, A concrete introduction to higher algebra, Springer (a quel punto ho
solo la definizione di anello e campo).<br>
</span></font><br>
F.C.<o:p></o:p></span></font></p>
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face="Times New Roman"><span style='font-size:12.0pt'>
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</span></font></div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>_______________________________________________<br>
Cabrinews mailing list<br>
Cabrinews@liste.keynes.scuole.bo.it<br>
http://keynes.scuole.bo.it/mailman/listinfo/cabrinews<o:p></o:p></span></font></p>
</blockquote>
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