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	<id>https://number.subwiki.org/w/index.php?action=history&amp;feed=atom&amp;title=Arithmetic_derivative</id>
	<title>Arithmetic derivative - Revision history</title>
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	<updated>2026-05-07T13:43:59Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
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	<entry>
		<id>https://number.subwiki.org/w/index.php?title=Arithmetic_derivative&amp;diff=880&amp;oldid=prev</id>
		<title>Vipul at 00:42, 23 June 2012</title>
		<link rel="alternate" type="text/html" href="https://number.subwiki.org/w/index.php?title=Arithmetic_derivative&amp;diff=880&amp;oldid=prev"/>
		<updated>2012-06-23T00:42:01Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 00:42, 23 June 2012&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l11&quot;&gt;Line 11:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 11:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;|-&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;|-&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;| direct definition in terms of prime factorization || Consider a natural number &amp;lt;math&amp;gt;n&amp;lt;/math&amp;gt; with prime factorization &amp;lt;math&amp;gt;n =  p_1^{k_1}p_2^{k_2} \dots p_r^{k_r}&amp;lt;/math&amp;gt; where the &amp;lt;math&amp;gt;p_i&amp;lt;/math&amp;gt; are all distinct primes and the &amp;lt;math&amp;gt;k_i&amp;lt;/math&amp;gt; are all &amp;#039;&amp;#039;positive&amp;#039;&amp;#039; integers (possibly repeated). Then the arithmetic derivative &amp;lt;math&amp;gt;n&amp;#039;&amp;lt;/math&amp;gt; is given by &amp;lt;math&amp;gt;n&amp;#039; = n \left(\sum_{i=1}^r \frac{k_i}{p_i}\right)&amp;lt;/math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;| direct definition in terms of prime factorization || Consider a natural number &amp;lt;math&amp;gt;n&amp;lt;/math&amp;gt; with prime factorization &amp;lt;math&amp;gt;n =  p_1^{k_1}p_2^{k_2} \dots p_r^{k_r}&amp;lt;/math&amp;gt; where the &amp;lt;math&amp;gt;p_i&amp;lt;/math&amp;gt; are all distinct primes and the &amp;lt;math&amp;gt;k_i&amp;lt;/math&amp;gt; are all &amp;#039;&amp;#039;positive&amp;#039;&amp;#039; integers (possibly repeated). Then the arithmetic derivative &amp;lt;math&amp;gt;n&amp;#039;&amp;lt;/math&amp;gt; is given by &amp;lt;math&amp;gt;n&amp;#039; = n \left(\sum_{i=1}^r \frac{k_i}{p_i}\right)&amp;lt;/math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;|}&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;==Higher derivatives==&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;Note that for any &amp;lt;math&amp;gt;n &amp;gt; 1&amp;lt;/math&amp;gt;, the arithmetic derivative of &amp;lt;math&amp;gt;n&amp;lt;/math&amp;gt; is nonzero, so the arithmetic derivative operation can be iterated for &amp;lt;math&amp;gt;n &amp;gt; 1&amp;lt;/math&amp;gt;. We can thus consider iterations of the arithmetic derivative operation, which are denoted by using multiple primes. Note that higher derivatives make sense only as long as we do not hit zero.&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;The second derivative of &amp;lt;math&amp;gt;n&amp;lt;/math&amp;gt;, for instance, is denoted &amp;lt;math&amp;gt;n&#039;&#039;&amp;lt;/math&amp;gt;.&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;==Relation with conjectures==&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;{| class=&quot;sortable&quot; border=&quot;1&quot;&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;! Conjecture !! What the conjecture, if true, would imply about the arithmetic derivative !! Explanation !! Is the converse implication true?&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;|-&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;| [[Goldbach&#039;s conjecture]]: every even integer greater than 2 is expressible as a sum of two primes. || For every even integer &amp;lt;math&amp;gt;2k&amp;lt;/math&amp;gt; with &amp;lt;math&amp;gt;k &amp;gt; 1&amp;lt;/math&amp;gt;, there exists an integer &amp;lt;math&amp;gt;n&amp;lt;/math&amp;gt; such that &amp;lt;math&amp;gt;n&#039; = 2k&amp;lt;/math&amp;gt;. || If &amp;lt;math&amp;gt;2k = p_1 + p_2&amp;lt;/math&amp;gt;, then we can take &amp;lt;math&amp;gt;n = p_1p_2&amp;lt;/math&amp;gt;. Note that this construction works regardless of whether &amp;lt;math&amp;gt;p_1,p_2&amp;lt;/math&amp;gt; are equal or distinct. || Not obviously so&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;|-&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;| [[twin primes conjecture]]: there exist infinitely many primes &amp;lt;math&amp;gt;p&amp;lt;/math&amp;gt; for which &amp;lt;math&amp;gt;p + 2&amp;lt;/math&amp;gt; is prime. || There exist infinitely many integers &amp;lt;math&amp;gt;n&amp;lt;/math&amp;gt; such that &amp;lt;math&amp;gt;n&#039;&#039; = 1&amp;lt;/math&amp;gt;. || For any prime &amp;lt;math&amp;gt;p&amp;lt;/math&amp;gt; such that &amp;lt;math&amp;gt;p + 2&amp;lt;/math&amp;gt; is prime, &amp;lt;math&amp;gt;n = 2p&amp;lt;/math&amp;gt; satisfies &amp;lt;math&amp;gt;n&#039;&#039; = 1&amp;lt;/math&amp;gt;. || Not obviously so&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;|}&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;|}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Vipul</name></author>
	</entry>
	<entry>
		<id>https://number.subwiki.org/w/index.php?title=Arithmetic_derivative&amp;diff=878&amp;oldid=prev</id>
		<title>Vipul: /* Definition */</title>
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		<updated>2012-06-23T00:33:22Z</updated>

		<summary type="html">&lt;p&gt;&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Definition&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 00:33, 23 June 2012&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l10&quot;&gt;Line 10:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 10:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;| using Leibniz rule and specification on primes || It is defined by the following three conditions:&amp;lt;br&amp;gt;&amp;lt;math&amp;gt;1&amp;#039; = 0&amp;lt;/math&amp;gt;&amp;lt;br&amp;gt;&amp;lt;math&amp;gt;p&amp;#039; = 1&amp;lt;/math&amp;gt; for any [[prime number]] &amp;lt;math&amp;gt;p&amp;lt;/math&amp;gt;&amp;lt;br&amp;gt;Leibniz rule: &amp;lt;math&amp;gt;(ab)&amp;#039; = a&amp;#039;b + ab&amp;#039;&amp;lt;/math&amp;gt; for any (possibly equal, possibly distinct) natural numbers &amp;lt;math&amp;gt;a,b&amp;lt;/math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;| using Leibniz rule and specification on primes || It is defined by the following three conditions:&amp;lt;br&amp;gt;&amp;lt;math&amp;gt;1&amp;#039; = 0&amp;lt;/math&amp;gt;&amp;lt;br&amp;gt;&amp;lt;math&amp;gt;p&amp;#039; = 1&amp;lt;/math&amp;gt; for any [[prime number]] &amp;lt;math&amp;gt;p&amp;lt;/math&amp;gt;&amp;lt;br&amp;gt;Leibniz rule: &amp;lt;math&amp;gt;(ab)&amp;#039; = a&amp;#039;b + ab&amp;#039;&amp;lt;/math&amp;gt; for any (possibly equal, possibly distinct) natural numbers &amp;lt;math&amp;gt;a,b&amp;lt;/math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;|-&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;|-&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;| direct definition in terms of prime factorization || Consider a natural number &amp;lt;math&amp;gt;n&amp;lt;/math&amp;gt; with prime factorization &amp;lt;math&amp;gt;n =  p_1^{k_1}p_2^{k_2} \dots p_r^{k_r}&amp;lt;/math&amp;gt; where the &amp;lt;math&amp;gt;p_i&amp;lt;/math&amp;gt; are all distinct primes and the &amp;lt;math&amp;gt;k_i&amp;lt;/math&amp;gt; are all &#039;&#039;positive&#039;&#039; integers (possibly repeated). Then the arithmetic derivative &amp;lt;math&amp;gt;n&#039;&amp;lt;/math&amp;gt; is given by &amp;lt;math&amp;gt;n&#039; = n \left\sum_{i=1}^r \frac{k_i}{p_i}\right)&amp;lt;/math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;| direct definition in terms of prime factorization || Consider a natural number &amp;lt;math&amp;gt;n&amp;lt;/math&amp;gt; with prime factorization &amp;lt;math&amp;gt;n =  p_1^{k_1}p_2^{k_2} \dots p_r^{k_r}&amp;lt;/math&amp;gt; where the &amp;lt;math&amp;gt;p_i&amp;lt;/math&amp;gt; are all distinct primes and the &amp;lt;math&amp;gt;k_i&amp;lt;/math&amp;gt; are all &#039;&#039;positive&#039;&#039; integers (possibly repeated). Then the arithmetic derivative &amp;lt;math&amp;gt;n&#039;&amp;lt;/math&amp;gt; is given by &amp;lt;math&amp;gt;n&#039; = n \left&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;(&lt;/ins&gt;\sum_{i=1}^r \frac{k_i}{p_i}\right)&amp;lt;/math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;|}&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;|}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Vipul</name></author>
	</entry>
	<entry>
		<id>https://number.subwiki.org/w/index.php?title=Arithmetic_derivative&amp;diff=877&amp;oldid=prev</id>
		<title>Vipul: Created page with &quot;{{arithmetic function}}  ==Definition==  The &#039;&#039;&#039;arithmetic derivative&#039;&#039;&#039; or &#039;&#039;&#039;number derivative&#039;&#039;&#039; is an arithmetic function, specifically a function from &lt;math&gt;\mathbb{N...&quot;</title>
		<link rel="alternate" type="text/html" href="https://number.subwiki.org/w/index.php?title=Arithmetic_derivative&amp;diff=877&amp;oldid=prev"/>
		<updated>2012-06-23T00:33:08Z</updated>

		<summary type="html">&lt;p&gt;Created page with &amp;quot;{{arithmetic function}}  ==Definition==  The &amp;#039;&amp;#039;&amp;#039;arithmetic derivative&amp;#039;&amp;#039;&amp;#039; or &amp;#039;&amp;#039;&amp;#039;number derivative&amp;#039;&amp;#039;&amp;#039; is an &lt;a href=&quot;/wiki/Arithmetic_function&quot; title=&quot;Arithmetic function&quot;&gt;arithmetic function&lt;/a&gt;, specifically a function from &amp;lt;math&amp;gt;\mathbb{N...&amp;quot;&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;{{arithmetic function}}&lt;br /&gt;
&lt;br /&gt;
==Definition==&lt;br /&gt;
&lt;br /&gt;
The &amp;#039;&amp;#039;&amp;#039;arithmetic derivative&amp;#039;&amp;#039;&amp;#039; or &amp;#039;&amp;#039;&amp;#039;number derivative&amp;#039;&amp;#039;&amp;#039; is an [[arithmetic function]], specifically a function from &amp;lt;math&amp;gt;\mathbb{N}&amp;lt;/math&amp;gt; to &amp;lt;math&amp;gt;\mathbb{N}_0&amp;lt;/math&amp;gt; denoted by the &amp;lt;math&amp;gt;{}^&amp;#039;&amp;lt;/math&amp;gt; superscript, defined in a number of equivalent ways.&lt;br /&gt;
&lt;br /&gt;
{| class=&amp;quot;sortable&amp;quot; border=&amp;quot;1&amp;quot;&lt;br /&gt;
! Definition type !! Definition details&lt;br /&gt;
|-&lt;br /&gt;
| using Leibniz rule and specification on primes || It is defined by the following three conditions:&amp;lt;br&amp;gt;&amp;lt;math&amp;gt;1&amp;#039; = 0&amp;lt;/math&amp;gt;&amp;lt;br&amp;gt;&amp;lt;math&amp;gt;p&amp;#039; = 1&amp;lt;/math&amp;gt; for any [[prime number]] &amp;lt;math&amp;gt;p&amp;lt;/math&amp;gt;&amp;lt;br&amp;gt;Leibniz rule: &amp;lt;math&amp;gt;(ab)&amp;#039; = a&amp;#039;b + ab&amp;#039;&amp;lt;/math&amp;gt; for any (possibly equal, possibly distinct) natural numbers &amp;lt;math&amp;gt;a,b&amp;lt;/math&amp;gt;&lt;br /&gt;
|-&lt;br /&gt;
| direct definition in terms of prime factorization || Consider a natural number &amp;lt;math&amp;gt;n&amp;lt;/math&amp;gt; with prime factorization &amp;lt;math&amp;gt;n =  p_1^{k_1}p_2^{k_2} \dots p_r^{k_r}&amp;lt;/math&amp;gt; where the &amp;lt;math&amp;gt;p_i&amp;lt;/math&amp;gt; are all distinct primes and the &amp;lt;math&amp;gt;k_i&amp;lt;/math&amp;gt; are all &amp;#039;&amp;#039;positive&amp;#039;&amp;#039; integers (possibly repeated). Then the arithmetic derivative &amp;lt;math&amp;gt;n&amp;#039;&amp;lt;/math&amp;gt; is given by &amp;lt;math&amp;gt;n&amp;#039; = n \left\sum_{i=1}^r \frac{k_i}{p_i}\right)&amp;lt;/math&amp;gt;&lt;br /&gt;
|}&lt;/div&gt;</summary>
		<author><name>Vipul</name></author>
	</entry>
</feed>