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      <pubDate>2023-02-16 22:54:00 UTC</pubDate>
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         <title>5000 a.c </title>
         <author>albizures099</author>
         <link>https://padlet.com/albizures099/1osjpa63u0i5ws0s/wish/2486795499</link>
         <description><![CDATA[<div>Primeras civilizaciones usaban huesos y piedras para contabilizar</div>]]></description>
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         <pubDate>2023-02-17 21:27:37 UTC</pubDate>
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         <title>3400 a.c</title>
         <author>albizures099</author>
         <link>https://padlet.com/albizures099/1osjpa63u0i5ws0s/wish/2486795806</link>
         <description><![CDATA[<div>En Mesopotamia los sumerios inventan el primer sistema de numeración.</div>]]></description>
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         <pubDate>2023-02-17 21:28:16 UTC</pubDate>
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         <title>2400 a.c </title>
         <author>albizures099</author>
         <link>https://padlet.com/albizures099/1osjpa63u0i5ws0s/wish/2486796147</link>
         <description><![CDATA[<div>En Egipto se inventa un calendario astronómico preciso.</div>]]></description>
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         <pubDate>2023-02-17 21:28:53 UTC</pubDate>
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         <title>530 a.c</title>
         <author>albizures099</author>
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         <description><![CDATA[<div>Pitágoras estudia las relaciones entre las medias aritmética, geométrica y armónica<br><br></div><div><br><br></div>]]></description>
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         <pubDate>2023-02-17 21:29:25 UTC</pubDate>
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         <title>350 a.c</title>
         <author>albizures099</author>
         <link>https://padlet.com/albizures099/1osjpa63u0i5ws0s/wish/2486796633</link>
         <description><![CDATA[<div>Aristóteles debate lógicamente razonando en el Órganon<em> </em>.</div>]]></description>
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         <pubDate>2023-02-17 21:30:03 UTC</pubDate>
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         <title>300 a.c</title>
         <author>albizures099</author>
         <link>https://padlet.com/albizures099/1osjpa63u0i5ws0s/wish/2486796823</link>
         <description><![CDATA[<div>En Irak&nbsp; los babilonios inventan el ábaco.</div>]]></description>
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         <pubDate>2023-02-17 21:30:28 UTC</pubDate>
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         <title>50 a.c</title>
         <author>albizures099</author>
         <link>https://padlet.com/albizures099/1osjpa63u0i5ws0s/wish/2486797063</link>
         <description><![CDATA[<div>En India empieza a desarrollarse la numeración india, el primer sistema de numeración de notación posicional de base diez.<br><br></div><div><br><br></div>]]></description>
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         <pubDate>2023-02-17 21:31:05 UTC</pubDate>
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         <title>1020 D.C.</title>
         <author>albizures099</author>
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         <description><![CDATA[<div>Abul Wafa da esta famosa fórmula: sen (α + β) = sen α cos β + sen β cos α.<br><br></div><div><br><br></div>]]></description>
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         <pubDate>2023-02-17 21:31:43 UTC</pubDate>
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         <title>1100 D.C.</title>
         <author>albizures099</author>
         <link>https://padlet.com/albizures099/1osjpa63u0i5ws0s/wish/2486798738</link>
         <description><![CDATA[<div>&nbsp;Los números indios han sido modificados por los matemáticos árabes para formar el moderno sistema números arábigos.</div>]]></description>
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         <pubDate>2023-02-17 21:34:38 UTC</pubDate>
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         <title>1100 D.C.</title>
         <author>albizures099</author>
         <link>https://padlet.com/albizures099/1osjpa63u0i5ws0s/wish/2486799139</link>
         <description><![CDATA[<div>el sistema arábigo alcanza Europa a través de las innovaciones árabes.<br><br></div><div><br><br></div>]]></description>
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         <pubDate>2023-02-17 21:35:31 UTC</pubDate>
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         <title>1518 D.C.</title>
         <author>albizures099</author>
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         <description><![CDATA[<div>Henricus Grammateus publica la primera obra impresa que utiliza los símbolos + y – para la adicción y la sustracción.</div>]]></description>
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         <pubDate>2023-02-17 21:36:10 UTC</pubDate>
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         <title>1591 D.C.</title>
         <author>albizures099</author>
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         <description><![CDATA[<div>Francois Viete utiliza letras para simbolizar incógnitas y constantes en ecuaciones algebraicas.</div>]]></description>
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         <pubDate>2023-02-17 21:37:23 UTC</pubDate>
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         <title>1614 D.C.</title>
         <author>albizures099</author>
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         <description><![CDATA[<div>John Npier presenta los logarigmos&nbsp; en su obra <em>Mirifici Logarithmorum Canonis Descriptio.</em></div>]]></description>
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         <pubDate>2023-02-17 21:38:10 UTC</pubDate>
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         <title>1796 D.C.</title>
         <author>albizures099</author>
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         <description><![CDATA[<div>&nbsp;Adrien Marie Legendre&nbsp; conjetura el teorema de los números primos.</div>]]></description>
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         <pubDate>2023-02-17 21:38:41 UTC</pubDate>
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         <title>2013 </title>
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         <description><![CDATA[<div>el matemático peruano Harald Helfgott (1977-) prueba la conjetura débil de Golbach.</div>]]></description>
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         <pubDate>2023-02-17 21:39:09 UTC</pubDate>
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