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<channel>
	<title>formelsamling.net&#187;  &#8211; Find det på formelsamling.net</title>
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	<link>http://www.formelsamling.net</link>
	<description>Matematikformler, fysikformler, kemiformler m.m.</description>
	<lastBuildDate>Wed, 10 Feb 2010 16:05:54 +0000</lastBuildDate>
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	<language>en</language>
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			<item>
		<title>Pythagoras læresætning</title>
		<link>http://www.formelsamling.net/matematikformler/pythagoras-l%c3%a6res%c3%a6tning/</link>
		<comments>http://www.formelsamling.net/matematikformler/pythagoras-l%c3%a6res%c3%a6tning/#comments</comments>
		<pubDate>Wed, 10 Feb 2010 16:05:54 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Matematikformler]]></category>
		<category><![CDATA[Pythagoras]]></category>
		<category><![CDATA[Retvinklet trekant]]></category>
		<category><![CDATA[Trekant]]></category>

		<guid isPermaLink="false">http://www.formelsamling.net/?p=118</guid>
		<description><![CDATA[Pythagoras læresætning anvendes til beregning af siderne i en retvinklet trekant. Sætningen er som følger:
Summen af kateternes kvadrater, i en retvinklet trekant, er lig med kvadratet på hypotenusen.
Formlen skrives som a2+b2=c2.
Hvor a og b er kateterne, c er hypotenusen. Se også tegningen herunder:

]]></description>
			<content:encoded><![CDATA[<p>Pythagoras læresætning anvendes til beregning af siderne i en retvinklet trekant. Sætningen er som følger:</p>
<blockquote><p><em>Summen af kateternes kvadrater, i en retvinklet trekant, er lig med kvadratet på hypotenusen.</em></p></blockquote>
<p>Formlen skrives som a<sup>2</sup>+b<sup>2</sup>=c<sup>2</sup>.</p>
<p>Hvor a og b er kateterne, c er hypotenusen. Se også tegningen herunder:</p>
<p><img class="alignnone" title="Retvinklet trekant" src="http://www.learner.org/workshops/algebra/workshop5/images/pythagorean.gif" alt="" width="161" height="137" /></p>
]]></content:encoded>
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		<item>
		<title>Enhedscirklen</title>
		<link>http://www.formelsamling.net/matematikformler/enhedscirklen/</link>
		<comments>http://www.formelsamling.net/matematikformler/enhedscirklen/#comments</comments>
		<pubDate>Tue, 15 Dec 2009 10:22:49 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Matematikformler]]></category>

		<guid isPermaLink="false">http://www.formelsamling.net/?p=113</guid>
		<description><![CDATA[
]]></description>
			<content:encoded><![CDATA[<p><img class="alignnone size-full wp-image-114" title="enhedscirklen" src="http://www.formelsamling.net/http://formelsamling.net/wp-content/uploads/2009/12/enhedscirklen.gif" alt="enhedscirklen" width="718" height="442" /></p>
]]></content:encoded>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Differentiation</title>
		<link>http://www.formelsamling.net/matematikformler/differentiation/</link>
		<comments>http://www.formelsamling.net/matematikformler/differentiation/#comments</comments>
		<pubDate>Tue, 15 Dec 2009 09:54:49 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Matematikformler]]></category>

		<guid isPermaLink="false">http://www.formelsamling.net/?p=107</guid>
		<description><![CDATA[Hvis y = f(x), så er differentialkvotienten (den afledte) af y:

Herudover kan differentialkvotienten betegnes som f&#8217;(x) eller y&#8217;.
Generelle differentiationsregler


]]></description>
			<content:encoded><![CDATA[<p>Hvis y = f(x), så er differentialkvotienten (den afledte) af y:</p>
<p><img class="alignnone size-full wp-image-108" title="differentiation1" src="http://www.formelsamling.net/http://formelsamling.net/wp-content/uploads/2009/12/differentiation1.gif" alt="differentiation1" width="326" height="82" /></p>
<p>Herudover kan differentialkvotienten betegnes som f&#8217;(x) eller y&#8217;.</p>
<h2>Generelle differentiationsregler</h2>
<p><img class="alignnone size-full wp-image-109" title="differentiationsregler1" src="http://www.formelsamling.net/http://formelsamling.net/wp-content/uploads/2009/12/differentiationsregler1.gif" alt="differentiationsregler1" width="255" height="304" /></p>
<p><img class="alignnone size-full wp-image-110" title="differentiationsregler2" src="http://www.formelsamling.net/http://formelsamling.net/wp-content/uploads/2009/12/differentiationsregler2.gif" alt="differentiationsregler2" width="196" height="227" /></p>
]]></content:encoded>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Binomialformlen</title>
		<link>http://www.formelsamling.net/matematikformler/binomialformlen/</link>
		<comments>http://www.formelsamling.net/matematikformler/binomialformlen/#comments</comments>
		<pubDate>Tue, 15 Dec 2009 09:48:33 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Matematikformler]]></category>

		<guid isPermaLink="false">http://www.formelsamling.net/?p=98</guid>
		<description><![CDATA[
eller

Binomialkoefficienterne er givet ved

]]></description>
			<content:encoded><![CDATA[<p><img class="alignnone size-full wp-image-101" title="binomialformlen1" src="http://www.formelsamling.net/http://formelsamling.net/wp-content/uploads/2009/12/binomialformlen1.gif" alt="binomialformlen1" width="523" height="36" /></p>
<p>eller</p>
<p><img class="alignnone size-full wp-image-102" title="binomialformlen2" src="http://www.formelsamling.net/http://formelsamling.net/wp-content/uploads/2009/12/binomialformlen2.gif" alt="binomialformlen2" width="457" height="51" /></p>
<p>Binomialkoefficienterne er givet ved</p>
<p><img class="alignnone size-full wp-image-103" title="binomialformlen3" src="http://www.formelsamling.net/http://formelsamling.net/wp-content/uploads/2009/12/binomialformlen3.gif" alt="binomialformlen3" width="412" height="51" /></p>
]]></content:encoded>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Aritmetik og algebra</title>
		<link>http://www.formelsamling.net/symboler/aritmetik-og-algebra/</link>
		<comments>http://www.formelsamling.net/symboler/aritmetik-og-algebra/#comments</comments>
		<pubDate>Thu, 10 Dec 2009 23:44:02 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Symboler]]></category>

		<guid isPermaLink="false">http://www.formelsamling.net/?p=52</guid>
		<description><![CDATA[Aritmetik og
algebra




Symbol
Betydning
Eksempel


=
lig med
a = b


¹
forskellig fra
b ¹
c



º


identisk
med

(x +
y) · (x &#8211; y) &#8211; (x2 - y2) º
0


&#62;
større end
a &#62;
b


&#60;
mindre end
a &#60;
b


*
mindre end eller lig med
a *
b


]
større end eller lig med
a ]
b


½
går op i, er divisor i
3½9


ł
går ikke op i
5 ł 11


º
kongruent med (modulo n)
p º
q (mod n) (betyder, at n½p
- q); 17 º
12 mod 5


sfd
største [...]]]></description>
			<content:encoded><![CDATA[<p style="line-height: 100%; margin-top: 1px; margin-bottom: 6px;"><strong>Aritmetik og<br />
algebra</strong></p>
<div>
<table style="height: 396px;" border="1" cellspacing="0" cellpadding="2" width="683">
<tbody>
<tr>
<td width="83" height="19" align="left" bgcolor="#c0c0c0">Symbol</td>
<td width="247" height="19" bgcolor="#c0c0c0">Betydning</td>
<td width="345" height="19" bgcolor="#c0c0c0">Eksempel</td>
</tr>
<tr>
<td width="83" height="19" align="left">=</td>
<td width="247" height="19">lig med</td>
<td width="345" height="19">a = b</td>
</tr>
<tr>
<td width="83" height="20" align="left"><span style="font-family: Symbol;">¹</span></td>
<td width="247" height="20">forskellig fra</td>
<td width="345" height="20">b <span style="font-family: Symbol;">¹<br />
</span>c</td>
</tr>
<tr>
<td width="83" height="20" align="left">
<p style="line-height: 100%;"><span style="font-size: 12pt; font-family: Symbol;">º</span></p>
</td>
<td width="247" height="20">
<p style="line-height: 100%; margin-top: 0pt; margin-bottom: 0pt;">identisk<br />
med</td>
<td width="345" height="20">
<p style="line-height: 100%; margin-top: 0pt; margin-bottom: 0pt;">(x +<br />
y) · (x &#8211; y) &#8211; (x<sup>2 </sup>- y<sup>2</sup>) <span style="font-size: 12pt; font-family: Symbol;">º<br />
</span>0</td>
</tr>
<tr>
<td width="83" height="20" align="left"><span style="font-size: 12pt; font-family: Symbol;">&gt;</span></td>
<td width="247" height="20">større end</td>
<td width="345" height="20">a <span style="font-size: 12pt; font-family: Symbol;">&gt;<br />
</span>b</td>
</tr>
<tr>
<td width="83" height="20" align="left"><span style="font-size: 12pt; font-family: Symbol;">&lt;</span></td>
<td width="247" height="20">mindre end</td>
<td width="345" height="20">a <span style="font-size: 12pt; font-family: Symbol;">&lt;<br />
</span>b</td>
</tr>
<tr>
<td width="83" height="19" align="left"><span style="font-size: 12pt; font-family: UniversalMath1 BT;">*</span></td>
<td width="247" height="19">mindre end eller lig med</td>
<td width="345" height="19">a <span style="font-size: 12pt; font-family: UniversalMath1 BT;">*<br />
</span>b</td>
</tr>
<tr>
<td width="83" height="20" align="left"><span style="font-size: 12pt; font-family: UniversalMath1 BT;">]</span></td>
<td width="247" height="20">større end eller lig med</td>
<td width="345" height="20">a <span style="font-size: 12pt; font-family: UniversalMath1 BT;">]</span><span style="font-size: 12pt; font-family: Symbol;"><br />
</span>b</td>
</tr>
<tr>
<td width="83" height="20" align="left"><span style="font-size: 12pt; font-family: Symbol;">½</span></td>
<td width="247" height="20">går op i, er divisor i</td>
<td width="345" height="20">3<span style="font-size: 12pt; font-family: Symbol;">½9</span></td>
</tr>
<tr>
<td width="83" height="20" align="left"><span style="font-size: 12pt; font-family: Tahoma;">ł</span></td>
<td width="247" height="20">går ikke op i</td>
<td width="345" height="20">5 <span style="font-size: 12pt; font-family: Tahoma;">ł 11</span></td>
</tr>
<tr>
<td width="83" height="20" align="left"><span style="font-size: 12pt; font-family: Symbol;">º</span></td>
<td width="247" height="20">kongruent med (modulo n)</td>
<td width="345" height="20">p <span style="font-size: 12pt; font-family: Symbol;">º</span></p>
<p>q (mod n) (betyder, at n<span style="font-size: 12pt; font-family: Symbol;">½</span>p<br />
- q); 17 <span style="font-size: 12pt; font-family: Symbol;">º<br />
</span>12 mod 5</td>
</tr>
<tr>
<td width="83" height="19" align="left"><em>sfd</em></td>
<td width="247" height="19">største fælles divisor (hele tal)</td>
<td width="345" height="19"><em>sfd</em>(12, 30) = 6</td>
</tr>
<tr>
<td width="83" height="19" align="left"><em>mfm</em></td>
<td width="247" height="19">mindste fælles multiplum for (hele tal)</td>
<td width="345" height="19"><em>mfm</em>(12, 30) = 60</td>
</tr>
<tr>
<td width="83" height="19" align="left">n!</td>
<td width="247" height="19">fakultet, &#8220;udråbstegn&#8221;</td>
<td width="345" height="19">n! = n(n-1)&#8230;.3 · 2 · 1; 5! = 120</td>
</tr>
<tr>
<td width="83" height="22" align="left"><em>P<sub>n,r</sub></em></td>
<td width="247" height="22">permutation</td>
<td width="345" height="22"><em>P<sub>n,r</sub></em> = n(n-1)&#8230;(n &#8211; r + 1)</td>
</tr>
<tr>
<td width="83" height="47" align="left">
<p style="line-height: 100%;"><em>K<sub>n,r</sub> </em>; <span style="font-size: 12pt; font-family: &quot;Times New Roman&quot;;"><span><br />
<img src="matema1.gif" alt="" width="22" height="41" align="bottom" /><!--[if gte mso 9]><xml><br />
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1025"   DrawAspect="Content" ObjectID="_1061663421"><br />
</o:OLEObject><br />
</xml><![endif]--><br />
</span><!--[if gte mso 9]><xml><br />
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1025"   DrawAspect="Content" ObjectID="_1061663365"><br />
</o:OLEObject><br />
</xml><![endif]--><br />
</span></td>
<td width="247" height="47">kombination</td>
<td width="345" height="47"><span style="font-size: 12pt; font-family: &quot;Times New Roman&quot;;"><span><br />
<img src="matema2.gif" alt="" width="155" height="41" align="bottom" /><!--[if gte mso 9]><xml><br />
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1025"   DrawAspect="Content" ObjectID="_1061663704"><br />
</o:OLEObject><br />
</xml><![endif]--><br />
</span><!--[if gte mso 9]><xml><br />
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1025"   DrawAspect="Content" ObjectID="_1061663654"><br />
</o:OLEObject><br />
</xml><![endif]--><br />
</span></td>
</tr>
<tr>
<td width="83" height="19" align="left">[], ent</td>
<td width="247" height="19">den hele del af</td>
<td width="345" height="19"><span style="font-size: 12pt; font-family: &quot;Times New Roman&quot;;"><span><img src="matema3.gif" alt="" width="107" height="27" /></span><!--[if gte mso 9]><xml><br />
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1025"   DrawAspect="Content" ObjectID="_1061664099"><br />
</o:OLEObject><br />
</xml><![endif]--><br />
</span></td>
</tr>
<tr>
<td width="83" height="19" align="left">+</td>
<td width="247" height="19">sum (af tal, udtryk, funktioner),<br />
&#8220;plus&#8221;</td>
<td width="345" height="19">3 + 8,  <em>f</em> + <em>g</em></td>
</tr>
<tr>
<td width="83" height="19" align="left"><span style="font-family: UniversalMath1 BT;">2</span><br />
, <span style="font-family: UniversalMath1 BT;">4</span></td>
<td width="247" height="19">differens, &#8220;minus&#8221;</td>
<td width="345" height="19">3 <span style="font-family: UniversalMath1 BT;">2</span>8,</p>
<p><em>f</em> <span style="font-family: UniversalMath1 BT;">2</span><em>g</em></td>
</tr>
<tr>
<td width="83" height="19" align="left"><em> <strong>· , </strong></em>x</td>
<td width="247" height="19">produkt, &#8220;gange&#8221;</td>
<td width="345" height="19">6 · 2, 6 x 2</td>
</tr>
<tr>
<td width="83" height="19" align="left">: , <span style="font-family: UniversalMath1 BT;">2</span>,<br />
/</td>
<td width="247" height="19">division (brøk), &#8220;divideret&#8221;</td>
<td width="345" height="19">6 : 2<span style="font-size: 12pt; font-family: &quot;Times New Roman&quot;;"><!--[if gte mso 9]><xml><br />
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1025"   DrawAspect="Content" ObjectID="_1061666640"><br />
</o:OLEObject><br />
</xml><![endif]--></p>
<p></span>, 6/2</td>
</tr>
<tr>
<td width="83" height="19" align="left">x<sup>n</sup></td>
<td width="247" height="19">potens (n hel positiv)</td>
<td width="345" height="19">x<sup>n</sup> = x · x · &#8230;· x (n gange)</td>
</tr>
<tr>
<td width="83" height="19" align="left" valign="bottom">
<p style="line-height: 100%; margin-top: 3px; margin-bottom: -6px;"><span style="font-size: 12pt; font-family: &quot;Times New Roman&quot;;"><span> </span><!--[if gte mso 9]><xml><br />
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1025"   DrawAspect="Content" ObjectID="_1061665190"><br />
</o:OLEObject><br />
</xml><![endif]--><br />
<span><img src="matema4.gif" alt="" width="27" height="23" /></span></span></td>
<td width="247" height="19" valign="bottom">
<p style="line-height: 100%; margin-top: 0pt; margin-bottom: 0pt;"><span style="font-size: 12pt; font-family: &quot;Times New Roman&quot;;"><span><br />
</span><!--[if gte mso 9]><xml><br />
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1025"   DrawAspect="Content" ObjectID="_1061665553"><br />
</o:OLEObject><br />
</xml><![endif]--><br />
rod (n hel positiv)</span></td>
<td width="345" height="19" valign="bottom">
<p style="line-height: 100%; margin-top: 3px; margin-bottom: -6px;"><span style="font-size: 12pt; font-family: &quot;Times New Roman&quot;;"><span><br />
</span><span style="font-size: 12pt; font-family: Times New Roman;"><img src="matema5.gif" alt="" width="67" height="29" /></span><!--[if gte mso 9]><xml><br />
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1025"   DrawAspect="Content" ObjectID="_1061665717"><br />
</o:OLEObject><br />
</xml><![endif]--><br />
</span></td>
</tr>
<tr>
<td width="83" height="19" align="left">x<sup>a</sup></td>
<td width="247" height="19">potens (a vilkårlig reel)</td>
<td width="345" height="19">
<p style="line-height: 100%; margin-top: 3px; margin-bottom: -6px;"><span style="font-size: 12pt; font-family: &quot;Times New Roman&quot;;"><span><br />
<img src="matema6.gif" alt="" width="67" height="27" /></span><!--[if gte mso 9]><xml><br />
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1025"   DrawAspect="Content" ObjectID="_1061665880"><br />
</o:OLEObject><br />
</xml><![endif]--><br />
</span></td>
</tr>
<tr>
<td width="83" height="19" align="left">
<p style="line-height: 100%; margin-top: 3px; margin-bottom: -6px;"><span style="font-size: 12pt; font-family: &quot;Times New Roman&quot;;"><span><br />
</span><span><img src="matema7.gif" alt="" width="19" height="27" /><!--[if gte mso 9]><xml><br />
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1025"   DrawAspect="Content" ObjectID="_1061665936"><br />
</o:OLEObject><br />
</xml><![endif]--></span></span></td>
<td width="247" height="19">numerisk (absolut) værdi</td>
<td width="345" height="19">
<p style="line-height: 100%; margin-top: 3px; margin-bottom: -6px;"><span style="font-size: 12pt; font-family: &quot;Times New Roman&quot;;"><span><br />
</span><span style="font-size: 12pt; font-family: Times New Roman;"><img src="matema8.gif" alt="" width="52" height="27" /></span><!--[if gte mso 9]><xml><br />
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1025"   DrawAspect="Content" ObjectID="_1061666050"><br />
</o:OLEObject><br />
</xml><![endif]--><br />
</span></td>
</tr>
<tr>
<td width="83" height="19" align="left">[ , ]</td>
<td width="247" height="19">afsluttet interval (lukket interval)</td>
<td width="345" height="19">[4,9] = { x | 4 <span style="font-size: 12pt; font-family: UniversalMath1 BT;">*<br />
</span>x <span style="font-size: 12pt; font-family: UniversalMath1 BT;">*<br />
</span>9}<span style="font-size: 12pt; font-family: UniversalMath1 BT;"> </span></td>
</tr>
<tr>
<td width="83" height="19" align="left">] , ]</td>
<td width="247" height="19">halvåbent interval</td>
<td width="345" height="19">]4,9] = { x | 4 &lt;<span style="font-size: 12pt; font-family: UniversalMath1 BT;"><br />
</span>x <span style="font-size: 12pt; font-family: UniversalMath1 BT;">*</span><span style="font-size: 12pt; font-family: UniversalMath1 BT;"><br />
</span>9}<span style="font-size: 12pt; font-family: UniversalMath1 BT;"> </span></td>
</tr>
<tr>
<td width="83" height="19" align="left">[ , [</td>
<td width="247" height="19">halvåbent interval</td>
<td width="345" height="19">[4,9[ = { x | 4 <span style="font-size: 12pt; font-family: UniversalMath1 BT;">*<br />
</span>x &lt; 9}<span style="font-size: 12pt; font-family: UniversalMath1 BT;"> </span></td>
</tr>
<tr>
<td width="83" height="19" align="left">] , [</td>
<td width="247" height="19">åbent interval</td>
<td width="345" height="19">]4,9[ = { x | 4 &lt; x &lt; 9 }</td>
</tr>
</tbody>
</table>
</div>
]]></content:encoded>
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		</item>
		<item>
		<title>Vi arbejder på at få flere formler online</title>
		<link>http://www.formelsamling.net/artikler/vi-arbejder-pa-at-fa-flere-formler-online/</link>
		<comments>http://www.formelsamling.net/artikler/vi-arbejder-pa-at-fa-flere-formler-online/#comments</comments>
		<pubDate>Thu, 10 Dec 2009 23:10:53 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Artikler]]></category>

		<guid isPermaLink="false">http://www.formelsamling.net/?p=45</guid>
		<description><![CDATA[I øjeblikket arbejdes der på højtryk med at få flere formler på formelsamling.net

Vi gør hvad vi kan for at få sitet til at fungere, og for at få formler online. Der kommer i øvrigt en funktion til at foreslå formler, og senere vil der være mulighed for at få hjælp direkte på sitet.
God fornøjelse med [...]]]></description>
			<content:encoded><![CDATA[<p>I øjeblikket arbejdes der på højtryk med at få flere formler på formelsamling.net</p>
<p><span id="more-45"></span></p>
<p>Vi gør hvad vi kan for at få sitet til at fungere, og for at få formler online. Der kommer i øvrigt en funktion til at foreslå formler, og senere vil der være mulighed for at få hjælp direkte på sitet.</p>
<p>God fornøjelse med det hele, og meld endelig tilbage hvis der er problemer!</p>
]]></content:encoded>
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		<item>
		<title>Formelsamling.net går i luften</title>
		<link>http://www.formelsamling.net/artikler/formelsamling-net-gar-i-luften/</link>
		<comments>http://www.formelsamling.net/artikler/formelsamling-net-gar-i-luften/#comments</comments>
		<pubDate>Wed, 09 Dec 2009 17:06:23 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Artikler]]></category>

		<guid isPermaLink="false">http://www.formelsamling.net/?p=25</guid>
		<description><![CDATA[Så går formelsamling.net i luften, med formler til et væld af forskellige formål. Vi forsøger at finde alle vigtige formler til matematik, fysik og kemi, men du er mere end velkommen til at kontakte os med andet.
]]></description>
			<content:encoded><![CDATA[<p>Så går formelsamling.net i luften, med formler til et væld af forskellige formål. Vi forsøger at finde alle vigtige formler til matematik, fysik og kemi, men du er mere end velkommen til at kontakte os med andet.</p>
]]></content:encoded>
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