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		<id>https://drorbn.net/index.php?title=Talk:06-240&amp;diff=4238</id>
		<title>Talk:06-240</title>
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		<updated>2007-03-02T00:09:34Z</updated>

		<summary type="html">&lt;p&gt;220.181.31.44: /* Modular Arithmetic */&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;If anyone is interested in typesetting the lectures I think they should follow these Wikipedia guidelines: http://en.wikipedia.org/wiki/WP:MSM&lt;br /&gt;
&lt;br /&gt;
== Modular Arithmetic ==&lt;br /&gt;
&lt;br /&gt;
This was particularly interesting after being introduced to Modular Multiplication tables and seeing some visual patterns with the numbers, such as the in the &#039;1&#039; column where the elements go from 1 to n-1 in Zn and backwards in the &#039;n-1&#039; column.&lt;br /&gt;
&lt;br /&gt;
After searching around, it seems that people had been able to discover other, more interesting patterns!&lt;br /&gt;
&lt;br /&gt;
Make sure to analyze the tables since they begin from the bottom left corner instead of top left which we saw in class.&lt;br /&gt;
&lt;br /&gt;
http://whistleralley.com/mod/mod25.htm&lt;br /&gt;
&lt;br /&gt;
The following site allows you to see tables up to mod 30.&lt;br /&gt;
&lt;br /&gt;
http://www.cut-the-knot.org/blue/Modulo.shtml&lt;br /&gt;
&lt;br /&gt;
-Richard&lt;br /&gt;
&lt;br /&gt;
Also, notice how in modular multiplication tables for prime numbers, in specific for modulo 5 in the columns and rows for 0 and 5 only 0s appear.  The 0s create a sort of frame around a 4x4 square of elements.  Specifically all elements within the frame of 0s are between 1 and n-1 and all are non-zero.  In the case of the mod 4 table there was a 0 which, as proved in class causes Z4 to fail as a field.  There must be something deeper about all those 0s.&lt;br /&gt;
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== Mistake in the timetable in the main page of 06-240? ==&lt;br /&gt;
&lt;br /&gt;
In the timetable in the main page of 06-240,i.e. http://katlas.math.toronto.edu/drorbn/index.php?title=06-240 , I think there&#039;s a mistake about the date of the first test. There, it&#039;s written Oct 23th, but we have no class on Oct 23 which is a Monday. I guess the correct date should be Oct 24th as written in the course outline. &lt;br /&gt;
&lt;br /&gt;
-Yanshuai&lt;br /&gt;
&lt;br /&gt;
The dates on the time table are the dates of the Mondays in each week; the header says &amp;quot;week of...&amp;quot;. --[[User:Drorbn|Drorbn]] 17:46, 9 October 2006 (EDT)&lt;br /&gt;
&lt;br /&gt;
== TA Office Hours? ==&lt;br /&gt;
&lt;br /&gt;
Do they have any?&lt;/div&gt;</summary>
		<author><name>220.181.31.44</name></author>
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