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	<title>Comments on: How To Write Mathematics Badly 3</title>
	<atom:link href="http://www.sixthform.info/maths/?feed=rss2&#038;p=149" rel="self" type="application/rss+xml" />
	<link>http://www.sixthform.info/maths/?p=149</link>
	<description>This site uses &#60;a href="http://sixthform.info/steve/wordpress" target="_blank"&#62;LatexRender&#60;/a&#62; for the mathematics</description>
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		<title>By: beans</title>
		<link>http://www.sixthform.info/maths/?p=149&#038;cpage=1#comment-572</link>
		<dc:creator>beans</dc:creator>
		<pubDate>Wed, 21 Mar 2007 21:31:42 +0000</pubDate>
		<guid isPermaLink="false">http://www.sixthform.info/maths/?p=149#comment-572</guid>
		<description>Grrr, I had &#039;forgotten&#039; to answer the question and hence lost my reply!! 

Adeel: I was just asking whether Steve would know it I had done the sum incorrectly! :p :o

BTW Steve, that&#039;s not fair! I haven&#039;t done them yet, although it&#039;s a good plan if you want me to shut my yap!</description>
		<content:encoded><![CDATA[<p>Grrr, I had &#8216;forgotten&#8217; to answer the question and hence lost my reply!! </p>
<p>Adeel: I was just asking whether Steve would know it I had done the sum incorrectly! :p <img src='http://www.sixthform.info/maths/wp-includes/images/smilies/icon_surprised.gif' alt=':o' class='wp-smiley' /> </p>
<p>BTW Steve, that&#8217;s not fair! I haven&#8217;t done them yet, although it&#8217;s a good plan if you want me to shut my yap!</p>
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		<title>By: steve</title>
		<link>http://www.sixthform.info/maths/?p=149&#038;cpage=1#comment-568</link>
		<dc:creator>steve</dc:creator>
		<pubDate>Wed, 21 Mar 2007 15:28:35 +0000</pubDate>
		<guid isPermaLink="false">http://www.sixthform.info/maths/?p=149#comment-568</guid>
		<description>Very tempting to ask instead for a solution to the partial differential equation [tex]\dfrac{\partial ^2 z}{\partial x^2}-\dfrac{\partial ^2 z}{\partial y^2}=\dfrac{2z}{x}[/tex] 
:)</description>
		<content:encoded><![CDATA[<p>Very tempting to ask instead for a solution to the partial differential equation <img src='/maths/latexrender/pictures/39074197e810629aa1ca2bd72edfd761.gif' title='\dfrac{\partial ^2 z}{\partial x^2}-\dfrac{\partial ^2 z}{\partial y^2}=\dfrac{2z}{x}' alt='\dfrac{\partial ^2 z}{\partial x^2}-\dfrac{\partial ^2 z}{\partial y^2}=\dfrac{2z}{x}' align=absmiddle/><br />
 <img src='http://www.sixthform.info/maths/wp-includes/images/smilies/icon_smile.gif' alt=':)' class='wp-smiley' /> </p>
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		<title>By: Adeel Khan</title>
		<link>http://www.sixthform.info/maths/?p=149&#038;cpage=1#comment-567</link>
		<dc:creator>Adeel Khan</dc:creator>
		<pubDate>Wed, 21 Mar 2007 15:05:18 +0000</pubDate>
		<guid isPermaLink="false">http://www.sixthform.info/maths/?p=149#comment-567</guid>
		<description>Whoa nice new theme.

@beans: the reason it asks you to do the sum is to prevent automatic spamming by bots.</description>
		<content:encoded><![CDATA[<p>Whoa nice new theme.</p>
<p>@beans: the reason it asks you to do the sum is to prevent automatic spamming by bots.</p>
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		<title>By: beans</title>
		<link>http://www.sixthform.info/maths/?p=149&#038;cpage=1#comment-558</link>
		<dc:creator>beans</dc:creator>
		<pubDate>Sat, 17 Mar 2007 12:49:31 +0000</pubDate>
		<guid isPermaLink="false">http://www.sixthform.info/maths/?p=149#comment-558</guid>
		<description>I think I&#039;ll stick with the three dots as well! I normally use that symbol for iff, but I guess you have a fair point about using &#039;iff&#039; in sentences! So  in theorems or proofs, it&#039;s best to write it out in full I suppose. (I got a big fat circle around iff on my work!) 

Grrr, I can&#039;t even write s.t anymore! (It&#039;s all for the best, but its much quicker to just write iff and s.t!)</description>
		<content:encoded><![CDATA[<p>I think I&#8217;ll stick with the three dots as well! I normally use that symbol for iff, but I guess you have a fair point about using &#8216;iff&#8217; in sentences! So  in theorems or proofs, it&#8217;s best to write it out in full I suppose. (I got a big fat circle around iff on my work!) </p>
<p>Grrr, I can&#8217;t even write s.t anymore! (It&#8217;s all for the best, but its much quicker to just write iff and s.t!)</p>
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		<title>By: steve</title>
		<link>http://www.sixthform.info/maths/?p=149&#038;cpage=1#comment-556</link>
		<dc:creator>steve</dc:creator>
		<pubDate>Sat, 17 Mar 2007 10:29:27 +0000</pubDate>
		<guid isPermaLink="false">http://www.sixthform.info/maths/?p=149#comment-556</guid>
		<description>Beans: I often use [tex]\therefore[/tex] but it seems to be going out of fashion. Similarly I use [tex]\Leftrightarrow[/tex] instead of iff which I think looks nicer. But if you are writing words rather than sentences it is better to use &lt;i&gt;if and only if&lt;/i&gt; otherwise it begins to look a bit like txt spk :)

So I would write [tex]x^2=1\Leftrightarrow x=\pm 1[/tex], or &lt;em&gt;[tex]x[/tex] is a solution of the equation [tex]x^2=1[/tex] if and only if [tex]x=\pm 1[/tex]&lt;/em&gt;.</description>
		<content:encoded><![CDATA[<p>Beans: I often use <img src='/maths/latexrender/pictures/132a246a32b3636371660621e977e4ec.gif' title='\therefore' alt='\therefore' align=absmiddle/> but it seems to be going out of fashion. Similarly I use <img src='/maths/latexrender/pictures/d1b2196508f5da0f6602bc74b9b263f9.gif' title='\Leftrightarrow' alt='\Leftrightarrow' align=absmiddle/> instead of iff which I think looks nicer. But if you are writing words rather than sentences it is better to use <i>if and only if</i> otherwise it begins to look a bit like txt spk <img src='http://www.sixthform.info/maths/wp-includes/images/smilies/icon_smile.gif' alt=':)' class='wp-smiley' /> </p>
<p>So I would write <img src='/maths/latexrender/pictures/1ffd1017310269b3d400320138394d8c.gif' title='x^2=1\Leftrightarrow x=\pm 1' alt='x^2=1\Leftrightarrow x=\pm 1' align=absmiddle/>, or <em><img src='/maths/latexrender/pictures/9dd4e461268c8034f5c8564e155c67a6.gif' title='x' alt='x' align=absmiddle/> is a solution of the equation <img src='/maths/latexrender/pictures/eb2e95e149a17b4fe2f9ec4505e75f07.gif' title='x^2=1' alt='x^2=1' align=absmiddle/> if and only if <img src='/maths/latexrender/pictures/3b8de766d75cf294b894f6db4211ecf0.gif' title='x=\pm 1' alt='x=\pm 1' align=absmiddle/></em>.</p>
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		<title>By: MIke</title>
		<link>http://www.sixthform.info/maths/?p=149&#038;cpage=1#comment-555</link>
		<dc:creator>MIke</dc:creator>
		<pubDate>Sat, 17 Mar 2007 01:41:22 +0000</pubDate>
		<guid isPermaLink="false">http://www.sixthform.info/maths/?p=149#comment-555</guid>
		<description>Hey, the layout has changed, very nice.</description>
		<content:encoded><![CDATA[<p>Hey, the layout has changed, very nice.</p>
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		<title>By: beans</title>
		<link>http://www.sixthform.info/maths/?p=149&#038;cpage=1#comment-554</link>
		<dc:creator>beans</dc:creator>
		<pubDate>Sat, 17 Mar 2007 00:16:09 +0000</pubDate>
		<guid isPermaLink="false">http://www.sixthform.info/maths/?p=149#comment-554</guid>
		<description>Forgot to mention- like the new look. It&#039;s cool! (and would you ever know if we do the sums that it asks us to do incorrectly??!! )

:D</description>
		<content:encoded><![CDATA[<p>Forgot to mention- like the new look. It&#8217;s cool! (and would you ever know if we do the sums that it asks us to do incorrectly??!! )</p>
<p> <img src='http://www.sixthform.info/maths/wp-includes/images/smilies/icon_biggrin.gif' alt=':D' class='wp-smiley' /> </p>
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	<item>
		<title>By: beans</title>
		<link>http://www.sixthform.info/maths/?p=149&#038;cpage=1#comment-553</link>
		<dc:creator>beans</dc:creator>
		<pubDate>Sat, 17 Mar 2007 00:14:34 +0000</pubDate>
		<guid isPermaLink="false">http://www.sixthform.info/maths/?p=149#comment-553</guid>
		<description>I&#039;m guilty of a few/most of the examples that you have mentioned! (especially the proof one!) Although, now I had learnt that if you do have the quadratic and want to solve it, you don&#039;t use the equals sign but iff! 

I guess I&#039;ve had that &#039;habit&#039; since school. But I haven&#039;t actually got the grasps of proofs yet (still waiting to one day waking up and being able to do them!). 

Just wondering- is there anything wrong with using the three dots for therefore, and writing &#039;iff&#039; instead of &#039;if and only if&#039;?</description>
		<content:encoded><![CDATA[<p>I&#8217;m guilty of a few/most of the examples that you have mentioned! (especially the proof one!) Although, now I had learnt that if you do have the quadratic and want to solve it, you don&#8217;t use the equals sign but iff! </p>
<p>I guess I&#8217;ve had that &#8216;habit&#8217; since school. But I haven&#8217;t actually got the grasps of proofs yet (still waiting to one day waking up and being able to do them!). </p>
<p>Just wondering- is there anything wrong with using the three dots for therefore, and writing &#8216;iff&#8217; instead of &#8216;if and only if&#8217;?</p>
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