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 <title>Open Problem Garden - Erdős–Straus conjecture - Comments</title>
 <link>http://openproblemgarden.org/op/erdos_straus_conjecture</link>
 <description>Comments for &quot;Erdős–Straus conjecture&quot;</description>
 <language>en</language>
<item>
 <title>Formula Individa  (re: Erdős–Straus conjecture)</title>
 <link>http://openproblemgarden.org/op/erdos_straus_conjecture#comment-75598</link>
 <description>&lt;p&gt;It was necessary to write the solution in a more General form:     &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/807f1f33a911bcd3a87be4081be5b405eaff65b1.png&quot; alt=&quot;$$\frac{t}{q}=\frac{1}{x}+\frac{1}{y}+\frac{1}{z}$$&quot; /&gt;     &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/2affc58196165da663a3081c4c1eb080981c09d9.png&quot; alt=&quot;$ t,q $&quot; /&gt; - integers.     Decomposing on the factors as follows: &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/aa0980adccd3b4277398303ea66ba8f1b7b94f84.png&quot; alt=&quot;$ p^2-s^2=(p-s)(p+s)=2qL $&quot; /&gt;     The solutions have the form:     &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/980401f858086d7a180716972af7458858f6699f.png&quot; alt=&quot;$$x=\frac{p(p-s)}{tL-q}$$&quot; /&gt;     &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/f877299162ad076133e9a477dbfd004349a6055b.png&quot; alt=&quot;$$y=\frac{p(p+s)}{tL-q}$$&quot; /&gt;     &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/503d60d4e432867df52530b820e9e784b4088769.png&quot; alt=&quot;$$z=L$$&quot; /&gt;    Decomposing on the factors as follows: &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/3bb7fc7425a68f6abea4ddbc17e640109d1696ed.png&quot; alt=&quot;$ p^2-s^2=(p-s)(p+s)=qL $&quot; /&gt;     The solutions have the form:    &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/092eac9d896960e0ad9c4a546eb447fda302c134.png&quot; alt=&quot;$$x=\frac{2p(p-s)}{tL-q}$$&quot; /&gt;     &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/5b0c1e6ebc0c0594a6369f56ba562ac46b1ad586.png&quot; alt=&quot;$$y=\frac{2p(p+s)}{tL-q}$$&quot; /&gt;     &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/503d60d4e432867df52530b820e9e784b4088769.png&quot; alt=&quot;$$z=L$$&quot; /&gt;&lt;/p&gt;
</description>
 <pubDate>Mon, 14 Jul 2014 17:39:25 +0200</pubDate>
 <dc:creator>Anonymous</dc:creator>
 <guid isPermaLink="false">comment 75598 at http://openproblemgarden.org</guid>
</item>
<item>
 <title>Solution  (re: Erdős–Straus conjecture)</title>
 <link>http://openproblemgarden.org/op/erdos_straus_conjecture#comment-75597</link>
 <description>&lt;p&gt;For the equation: &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/085f70989da8ae707a8e4c6363272fd4717397c5.png&quot; alt=&quot;$$\frac{4}{q}=\frac{1}{x}+\frac{1}{y}+\frac{1}{z}$$&quot; /&gt;    The solution can be written using the factorization, as follows.     &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/40d0ab770d1ce23887bbac72b7e3c9a716ba2b66.png&quot; alt=&quot;$$p^2-s^2=(p-s)(p+s)=2qL$$&quot; /&gt;     Then the solutions have the form:     &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/fc70d79a847ab0edcd54743d9403b579394129f3.png&quot; alt=&quot;$$x=\frac{p(p-s)}{4L-q}$$&quot; /&gt;     &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/37dbcf59e269093bc2dd75864d9ad10f15ed2e0a.png&quot; alt=&quot;$$y=\frac{p(p+s)}{4L-q}$$&quot; /&gt;     &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/503d60d4e432867df52530b820e9e784b4088769.png&quot; alt=&quot;$$z=L$$&quot; /&gt;     I usually choose the number &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/73f33398d7e8aa42e6ec25ee2bb4f2b57ed3391a.png&quot; alt=&quot;$ L $&quot; /&gt; such that the difference: &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/cc60d0fcfdf5557727564d557f0af275cf0a66b1.png&quot; alt=&quot;$ (4L-q) $&quot; /&gt; was equal to: &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/f77f205347d380703c1598cd13b0aeeb75f114fc.png&quot; alt=&quot;$ 1,2,3,4 $&quot; /&gt;   Although your desire you can choose other.  You can write a little differently.  If unfold like this:  &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/7fb33c19a24ac5ece27fa4787e8755b2b863287c.png&quot; alt=&quot;$$p^2-s^2=(p-s)(p+s)=qL$$&quot; /&gt;   The solutions have the form:   &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/1b6376b87ef58d4208797b6d85368acea18242b8.png&quot; alt=&quot;$$x=\frac{2p(p-s)}{4L-q}$$&quot; /&gt;   &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/ca17d15ea6227afa5c327b6bffdfa886e153fc01.png&quot; alt=&quot;$$y=\frac{2p(p+s)}{4L-q}$$&quot; /&gt;   &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/503d60d4e432867df52530b820e9e784b4088769.png&quot; alt=&quot;$$z=L$$&quot; /&gt;&lt;/p&gt;
</description>
 <pubDate>Mon, 14 Jul 2014 17:36:44 +0200</pubDate>
 <dc:creator>Anonymous</dc:creator>
 <guid isPermaLink="false">comment 75597 at http://openproblemgarden.org</guid>
</item>
<item>
 <title>Restriction  (re: Erdős–Straus conjecture)</title>
 <link>http://openproblemgarden.org/op/erdos_straus_conjecture#comment-44633</link>
 <description>&lt;p&gt;Done. Thank you.&lt;/p&gt;
</description>
 <pubDate>Mon, 15 Jul 2013 18:45:49 +0200</pubDate>
 <dc:creator>ACW</dc:creator>
 <guid isPermaLink="false">comment 44633 at http://openproblemgarden.org</guid>
</item>
<item>
 <title>Further restriction  (re: Erdős–Straus conjecture)</title>
 <link>http://openproblemgarden.org/op/erdos_straus_conjecture#comment-44414</link>
 <description>&lt;p&gt;I think you need to specify that &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/e7ba5befcaa0d78e43b5176d70ce67425fd0fcdc.png&quot; alt=&quot;$ x $&quot; /&gt;, &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/739107c42bdb8452402d548efae98c3ce282847d.png&quot; alt=&quot;$ y $&quot; /&gt; and &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/f85c568d15531a4d87b62ef8ad394a91b34ba1a0.png&quot; alt=&quot;$ z $&quot; /&gt; be positive for this to be challenging (and open).&lt;/p&gt;
</description>
 <pubDate>Sun, 14 Jul 2013 23:38:49 +0200</pubDate>
 <dc:creator>cpbm</dc:creator>
 <guid isPermaLink="false">comment 44414 at http://openproblemgarden.org</guid>
</item>
<item>
 <title>Erdős–Straus conjecture</title>
 <link>http://openproblemgarden.org/op/erdos_straus_conjecture</link>
 <description>&lt;table cellspacing=&quot;10&quot;&gt;
&lt;tr&gt;
  &lt;td&gt;
    Author(s):
        &lt;a href=&quot;/category/erdos&quot;&gt;Erdos&lt;/a&gt;; &lt;a href=&quot;/category/straus_ernst_g&quot;&gt;Straus&lt;/a&gt;&amp;nbsp;&amp;nbsp;
  &lt;/td&gt;
  &lt;td align=right&gt;
    Subject:
        &lt;a href=&quot;/category/number_theory_0&quot;&gt;Number Theory&lt;/a&gt;&amp;nbsp;&amp;nbsp;
  &lt;/td&gt;
&lt;/tr&gt;

&lt;tr&gt;
  &lt;td colspan=2&gt;
    &lt;table border=1 cellspacing=&quot;5&quot;&gt;
      &lt;tr&gt;&lt;td&gt;
        &lt;div class=&quot;envtheorem&quot;&gt;&lt;b&gt;Conjecture&lt;/b&gt;&amp;nbsp;&amp;nbsp;&lt;/p&gt;
&lt;p&gt;For all &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/c8948e202d1b5f8dd3dcdd9dffc1dead386c3c87.png&quot; alt=&quot;$ n &amp;gt; 2 $&quot; /&gt;, there exist positive integers &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/e7ba5befcaa0d78e43b5176d70ce67425fd0fcdc.png&quot; alt=&quot;$ x $&quot; /&gt;, &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/739107c42bdb8452402d548efae98c3ce282847d.png&quot; alt=&quot;$ y $&quot; /&gt;, &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/f85c568d15531a4d87b62ef8ad394a91b34ba1a0.png&quot; alt=&quot;$ z $&quot; /&gt; such that &lt;img class=&quot;teximage&quot; src=&quot;/files/tex/ab516147f515e0ef27b92932f027fdc90c9cede7.png&quot; alt=&quot;$$1/x + 1/y + 1/z = 4/n$$&quot; /&gt;.&lt;/p&gt;
&lt;/div&gt;

      &lt;/tr&gt;&lt;/td&gt;
    &lt;/table&gt;
  &lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;</description>
 <category domain="http://openproblemgarden.org/category/erdos">Erdos, Paul</category>
 <category domain="http://openproblemgarden.org/category/straus_ernst_g">Straus, Ernst G.</category>
 <category domain="http://openproblemgarden.org/category/egyptian_fraction">Egyptian fraction</category>
 <category domain="http://openproblemgarden.org/category/number_theory_0">Number Theory</category>
 <comments>http://openproblemgarden.org/op/erdos_straus_conjecture#comment</comments>
 <pubDate>Tue, 28 Feb 2012 23:37:15 +0100</pubDate>
 <dc:creator>ACW</dc:creator>
 <guid isPermaLink="false">37397 at http://openproblemgarden.org</guid>
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