<story><title>Potato paradox</title><url>https://en.wikipedia.org/wiki/Potato_paradox</url></story><parent_chain><item><author>chestervonwinch</author><text>Neat. This bumps up my list of food-related maths from 3 to 4. So far:&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Ham_sandwich_theorem&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Ham_sandwich_theorem&lt;/a&gt;&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Pizza_theorem&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Pizza_theorem&lt;/a&gt;&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Layer_cake_representation&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Layer_cake_representation&lt;/a&gt;</text></item></parent_chain><comment><author>gjm11</author><text>One of the people I went to university with had a little (very short) mental catalogue of &amp;quot;chromatic mathematical fruit jokes&amp;quot;. There are exactly two famous ones. &amp;quot;What&amp;#x27;s purple and commutes?&amp;quot; &amp;quot;An abelian grape.&amp;quot; And: &amp;quot;What&amp;#x27;s yellow and equivalent to the axiom of choice?&amp;quot; &amp;quot;Zorn&amp;#x27;s lemon.&amp;quot; He invented another, which requires more esoteric knowledge: &amp;quot;What&amp;#x27;s green and determined up to isomorphism by its first Chern class?&amp;quot; &amp;quot;A lime bundle.&amp;quot; I don&amp;#x27;t remember whether anyone found a credible fourth example.&lt;p&gt;(Oh, how we laughed.)&lt;p&gt;[In case anyone reading this thinks the above might be amusing if only they knew what mathematical objects were actually being referred to: (1) No, probably not. (2) Abelian group; Zorn&amp;#x27;s lemma; line bundle. For the last one, you need to make it the first &lt;i&gt;Stiefel-Whitney&lt;/i&gt; class if you&amp;#x27;re working over the real numbers rather than the complex numbers.]</text></comment>
<story><title>Potato paradox</title><url>https://en.wikipedia.org/wiki/Potato_paradox</url></story><parent_chain><item><author>chestervonwinch</author><text>Neat. This bumps up my list of food-related maths from 3 to 4. So far:&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Ham_sandwich_theorem&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Ham_sandwich_theorem&lt;/a&gt;&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Pizza_theorem&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Pizza_theorem&lt;/a&gt;&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Layer_cake_representation&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Layer_cake_representation&lt;/a&gt;</text></item></parent_chain><comment><author>leohutson</author><text>You can add &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Pancake_sorting&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Pancake_sorting&lt;/a&gt;</text></comment>