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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<link rel="stylesheet" href="https://openmath.org/public/css/hyde.css"/>
<link rel="stylesheet" href="https://openmath.org/public/css/main.css"/>
<link rel="shortcut icon" sizes="144x144" type="image/png" href="/public/favicon.png"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js?config=TeX-AMS-MML_SVG"> </script>
<script type="text/javascript"> function divfold(_Id){
var thisLevel = document.getElementById(_Id);
var thisLevela = document.getElementById(_Id.concat("a"))
if(thisLevel.style.display != "none"){
thisLevel.style.display = "none";
thisLevela.style.backgroundColor = "#CCCCCC";}
else{
thisLevel.style.display = "block";
thisLevela.style.backgroundColor = "#AAFFAA";}
}
</script>
<title>arith1</title>
<link rel="stylesheet" href="https://openmath.org/cd/omcd.css" type="text/css"/>
</head>
<body class="theme-base-odk">
<div class="sidebar">
<div class="container">
<div class="sidebar-about">
<h1>
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<img src="https://openmath.org/public/logo.png" alt="OpenMath" width="100%"/>
</a>
</h1>
<p class="lead">OpenMath is an extensible standard for representing the semantics of mathematical objects.</p>
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</p>
</div>
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</div>
<div class="content container">
<div class="page">
<a name="top"/>
<h1>OpenMath Content Dictionary: arith1</h1>
<dl>
<dt>
<span class="dt">Canonical URL:</span>
</dt>
<dd>
<a href="http://www.openmath.org/cd/arith1.ocd">http://www.openmath.org/cd/arith1.ocd</a>
</dd>
<dt>
<span class="dt">CD Base:</span>
</dt>
<dd>
<a href="http://www.openmath.org/cd">http://www.openmath.org/cd</a>
</dd>
<dt>
<span class="dt">CD File:</span>
</dt>
<dd>
<a href="arith1.ocd">arith1.ocd
</a>
</dd>
<dt>
<span class="dt">CD as XML Encoded OpenMath:</span>
</dt>
<dd>
<a href="arith1.omcd">arith1.omcd
</a>
</dd>
<dt>
<span class="dt">Defines:</span>
</dt>
<dd>
<a href="#abs">abs</a>, <a href="#divide">divide</a>, <a href="#gcd">gcd</a>, <a href="#lcm">lcm</a>, <a href="#minus">minus</a>, <a href="#plus">plus</a>, <a href="#power">power</a>, <a href="#product">product</a>, <a href="#root">root</a>, <a href="#sum">sum</a>, <a href="#times">times</a>, <a href="#unary_minus">unary_minus</a>
</dd>
<dt>
<span class="dt">Date:</span>
</dt>
<dd>2004-03-30</dd>
<dt>
<span class="dt">Version:</span>
</dt>
<dd>3
(Revision 1)
</dd>
<dt>
<span class="dt">Review Date:</span>
</dt>
<dd>2006-03-30</dd>
<dt>
<span class="dt">Status:</span>
</dt>
<dd>official</dd>
</dl>
<hr/>
<pre>
This document is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
The copyright holder grants you permission to redistribute this
document freely as a verbatim copy. Furthermore, the copyright
holder permits you to develop any derived work from this document
provided that the following conditions are met.
a) The derived work acknowledges the fact that it is derived from
this document, and maintains a prominent reference in the
work to the original source.
b) The fact that the derived work is not the original OpenMath
document is stated prominently in the derived work. Moreover if
both this document and the derived work are Content Dictionaries
then the derived work must include a different CDName element,
chosen so that it cannot be confused with any works adopted by
the OpenMath Society. In particular, if there is a Content
Dictionary Group whose name is, for example, `math' containing
Content Dictionaries named `math1', `math2' etc., then you should
not name a derived Content Dictionary `mathN' where N is an integer.
However you are free to name it `private_mathN' or some such. This
is because the names `mathN' may be used by the OpenMath Society
for future extensions.
c) The derived work is distributed under terms that allow the
compilation of derived works, but keep paragraphs a) and b)
intact. The simplest way to do this is to distribute the derived
work under the OpenMath license, but this is not a requirement.
If you have questions about this license please contact the OpenMath
society at <a href="http://www.openmath.org">http://www.openmath.org</a>.
</pre>
<pre>
Author: OpenMath Consortium
SourceURL: <a href="https://github.com/OpenMath/CDs">https://github.com/OpenMath/CDs</a>
</pre>
<p>
This CD defines symbols for common arithmetic functions.
</p>
<hr/>
<h2>
<a name="lcm">lcm</a>
</h2>
<dl>
<dt>
<span class="dt">Role:</span>
</dt>
<dd>application</dd>
</dl>
<dl>
<dt>
<span class="dt">Description:</span>
</dt>
<dd>
<p>
The symbol to represent the n-ary function to return the least common
multiple of its arguments.
</p>
</dd>
</dl>
<dl>
<dt>
<span class="dt">Commented Mathematical property (CMP):</span>
</dt>
<dd> lcm(a,b) = a*b/gcd(a,b) </dd>
</dl>
<dl>
<dt>
<span class="dt">Formal Mathematical property (FMP):</span>
</dt>
<dd>
<div>
<button id="id.om.15xmla" style="width:20em; background-color:#CCCCCC"
onclick="divfold('id.om.15xml')">OpenMath XML (source)</button>
<pre id="id.om.15xml" style="display:none">
<OMOBJ xmlns="http://www.openmath.org/OpenMath" version="2.0" cdbase="http://www.openmath.org/cd">
<OMA>
<OMS cd="relation1" name="eq"/>
<OMA>
<OMS cd="arith1" name="lcm"/>
<OMV name="a"/>
<OMV name="b"/>
</OMA>
<OMA>
<OMS cd="arith1" name="divide"/>
<OMA>
<OMS cd="arith1" name="times"/>
<OMV name="a"/>
<OMV name="b"/>
</OMA>
<OMA>
<OMS cd="arith1" name="gcd"/>
<OMV name="a"/>
<OMV name="b"/>
</OMA>
</OMA>
</OMA>
</OMOBJ></pre>
</div>
<div>
<button id="id.om.15cmmla" style="width:20em; background-color:#CCCCCC"
onclick="divfold('id.om.15cmml')">Strict Content MathML</button>
<pre id="id.om.15cmml" style="display:none; margin-top: 0.5em">
<math xmlns="http://www.w3.org/1998/Math/MathML">
<apply><csymbol cd="relation1">eq</csymbol>
<apply><csymbol cd="arith1">lcm</csymbol><ci>a</ci><ci>b</ci></apply>
<apply><csymbol cd="arith1">divide</csymbol>
<apply><csymbol cd="arith1">times</csymbol><ci>a</ci><ci>b</ci></apply>
<apply><csymbol cd="arith1">gcd</csymbol><ci>a</ci><ci>b</ci></apply>
</apply>
</apply>
</math></pre>
</div>
<button id="id.om.15prefa" style="width:20em; background-color:#CCCCCC"
onclick="divfold('id.om.15pref')">Prefix</button>
<div id="id.om.15pref" style="display:none; margin-top: 0.5em">
<a href="../../../cd/relation1.html#eq">eq</a>
(<a href="../../../cd/arith1.html#lcm">lcm</a>
( <i>a</i>, <i>b</i>)
, <a href="../../../cd/arith1.html#divide">divide</a>
(<a href="../../../cd/arith1.html#times">times</a>
( <i>a</i>, <i>b</i>)
, <a href="../../../cd/arith1.html#gcd">gcd</a>
( <i>a</i>, <i>b</i>)
)
)
</div>
<div>
<button id="id.om.15popa" style="width:20em; background-color:#CCCCCC"
onclick="divfold('id.om.15pop')">Popcorn</button>
<div id="id.om.15pop" style="display:none; margin-top: 0.5em">
arith1.lcm($a, $b) = ($a * $b) / arith1.gcd($a, $b)
</div>
</div>
<div>
<button id="id.om.15mmla" style="width:20em; background-color:#AAFFAA"
onclick="divfold('id.om.15mml')">Rendered Presentation MathML</button>
<div id="id.om.15mml" style="display:block; margin-top: 0.5em">
<div style="overflow:auto;font-size:90%">
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
<mrow xmlns:om="http://www.openmath.org/OpenMath">
<mrow>
<mi>lcm</mi>
<mo>⁡</mo>
<mrow>
<mo>(</mo>
<mi>a</mi>
<mo>,</mo>
<mi>b</mi>
<mo>)</mo>
</mrow>
</mrow>
<mo>=</mo>
<mfrac>
<mrow>
<mi>a</mi>
<mo>⁢</mo>
<mi>b</mi>
</mrow>
<mrow>
<mi>gcd</mi>
<mo>⁡</mo>
<mrow>
<mo>(</mo>
<mi>a</mi>
<mo>,</mo>
<mi>b</mi>
<mo>)</mo>
</mrow>
</mrow>
</mfrac>
</mrow>
</math>
</div>
</div>
</div>
</dd>
</dl>
<dl>
<dt>
<span class="dt">Commented Mathematical property (CMP):</span>
</dt>
<dd>
for all integers a,b |
There does not exist a c>0 such that c/a is an Integer and c/b is an
Integer and lcm(a,b) > c.
</dd>
</dl>
<dl>
<dt>
<span class="dt">Formal Mathematical property (FMP):</span>
</dt>
<dd>
<div>
<button id="id.om.34xmla" style="width:20em; background-color:#CCCCCC"
onclick="divfold('id.om.34xml')">OpenMath XML (source)</button>
<pre id="id.om.34xml" style="display:none">
<OMOBJ xmlns="http://www.openmath.org/OpenMath" version="2.0" cdbase="http://www.openmath.org/cd">
<OMBIND>
<OMS cd="quant1" name="forall"/>
<OMBVAR>
<OMV name="a"/>
<OMV name="b"/>
</OMBVAR>
<OMA>
<OMS cd="logic1" name="implies"/>
<OMA>
<OMS cd="logic1" name="and"/>
<OMA>
<OMS cd="set1" name="in"/>
<OMV name="a"/>
<OMS cd="setname1" name="Z"/>
</OMA>
<OMA>
<OMS cd="set1" name="in"/>
<OMV name="b"/>
<OMS cd="setname1" name="Z"/>
</OMA>
</OMA>
<OMA>
<OMS cd="logic1" name="not"/>
<OMBIND>
<OMS cd="quant1" name="exists"/>
<OMBVAR>
<OMV name="c"/>
</OMBVAR>
<OMA>
<OMS cd="logic1" name="and"/>
<OMA>
<OMS cd="relation1" name="gt"/>
<OMV name="c"/>
<OMI>0</OMI>
</OMA>
<OMA>
<OMS cd="integer1" name="factorof"/>
<OMV name="a"/>
<OMV name="c"/>
</OMA>
<OMA>
<OMS cd="integer1" name="factorof"/>
<OMV name="b"/>
<OMV name="c"/>
</OMA>
<OMA>
<OMS cd="relation1" name="lt"/>
<OMV name="c"/>
<OMA>
<OMS cd="arith1" name="lcm"/>
<OMV name="a"/>
<OMV name="b"/>
</OMA>
</OMA>
</OMA>
</OMBIND>
</OMA>
</OMA>
</OMBIND>
</OMOBJ></pre>
</div>
<div>
<button id="id.om.34cmmla" style="width:20em; background-color:#CCCCCC"
onclick="divfold('id.om.34cmml')">Strict Content MathML</button>
<pre id="id.om.34cmml" style="display:none; margin-top: 0.5em">
<math xmlns="http://www.w3.org/1998/Math/MathML">
<bind><csymbol cd="quant1">forall</csymbol>
<bvar><ci>a</ci></bvar>
<bvar><ci>b</ci></bvar>
<apply><csymbol cd="logic1">implies</csymbol>
<apply><csymbol cd="logic1">and</csymbol>
<apply><csymbol cd="set1">in</csymbol><ci>a</ci><csymbol cd="setname1">Z</csymbol></apply>
<apply><csymbol cd="set1">in</csymbol><ci>b</ci><csymbol cd="setname1">Z</csymbol></apply>
</apply>
<apply><csymbol cd="logic1">not</csymbol>
<bind><csymbol cd="quant1">exists</csymbol>
<bvar><ci>c</ci></bvar>
<apply><csymbol cd="logic1">and</csymbol>
<apply><csymbol cd="relation1">gt</csymbol><ci>c</ci><cn type="integer">0</cn></apply>
<apply><csymbol cd="integer1">factorof</csymbol><ci>a</ci><ci>c</ci></apply>
<apply><csymbol cd="integer1">factorof</csymbol><ci>b</ci><ci>c</ci></apply>
<apply><csymbol cd="relation1">lt</csymbol>
<ci>c</ci>
<apply><csymbol cd="arith1">lcm</csymbol><ci>a</ci><ci>b</ci></apply>
</apply>
</apply>
</bind>
</apply>
</apply>
</bind>
</math></pre>
</div>
<button id="id.om.34prefa" style="width:20em; background-color:#CCCCCC"
onclick="divfold('id.om.34pref')">Prefix</button>
<div id="id.om.34pref" style="display:none; margin-top: 0.5em">
<a href="../../../cd/quant1.html#forall">forall</a>
[
<i>a</i>
<i>b</i>
] .
(<a href="../../../cd/logic1.html#implies">implies</a>
(<a href="../../../cd/logic1.html#and">and</a>
(<a href="../../../cd/set1.html#in">in</a>
( <i>a</i>, <a href="../../../cd/setname1.html#Z">Z</a>)
, <a href="../../../cd/set1.html#in">in</a>
( <i>b</i>, <a href="../../../cd/setname1.html#Z">Z</a>)
)
, <a href="../../../cd/logic1.html#not">not</a>
(<a href="../../../cd/quant1.html#exists">exists</a>
[
<i>c</i>
] .
(<a href="../../../cd/logic1.html#and">and</a>
(<a href="../../../cd/relation1.html#gt">gt</a>
( <i>c</i>, 0)
, <a href="../../../cd/integer1.html#factorof">factorof</a>
( <i>a</i>, <i>c</i>)
, <a href="../../../cd/integer1.html#factorof">factorof</a>
( <i>b</i>, <i>c</i>)
, <a href="../../../cd/relation1.html#lt">lt</a>
( <i>c</i>, <a href="../../../cd/arith1.html#lcm">lcm</a>
( <i>a</i>, <i>b</i>)
)
)
)
)
)
)
</div>
<div>
<button id="id.om.34popa" style="width:20em; background-color:#CCCCCC"
onclick="divfold('id.om.34pop')">Popcorn</button>
<div id="id.om.34pop" style="display:none; margin-top: 0.5em">
quant1.forall[$a, $b -> set1.in($a, setname1.Z) and set1.in($b, setname1.Z) ==> not(quant1.exists[$c -> $c > 0 and integer1.factorof($a, $c) and integer1.factorof($b, $c) and $c < arith1.lcm($a, $b)])]
</div>
</div>
<div>
<button id="id.om.34mmla" style="width:20em; background-color:#AAFFAA"
onclick="divfold('id.om.34mml')">Rendered Presentation MathML</button>
<div id="id.om.34mml" style="display:block; margin-top: 0.5em">
<div style="overflow:auto;font-size:90%">
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
<mrow xmlns:om="http://www.openmath.org/OpenMath">
<mo>∀</mo>
<mo> </mo>
<mrow>
<mi>a</mi>
<mo>,</mo>
<mi>b</mi>
</mrow>
<mo>.</mo>
<mrow>
<mrow>
<mrow>
<mi>a</mi>
<mo>∈</mo>
<mi mathvariant="double-struck">Z</mi>
</mrow>
<mo>∧</mo>
<mrow>
<mi>b</mi>
<mo>∈</mo>
<mi mathvariant="double-struck">Z</mi>
</mrow>
</mrow>
<mo>⇒</mo>
<mo>¬</mo>
<mrow>
<mo>∃</mo>
<mo> </mo>
<mrow>
<mi>c</mi>
</mrow>
<mo>.</mo>
<mrow>
<mrow>
<mi>c</mi>
<mo>></mo>
<mn>0</mn>
</mrow>
<mo>∧</mo>
<mrow>
<mi>factorof</mi>
<mo>⁡</mo>
<mrow>
<mo>(</mo>
<mi>a</mi>
<mo>,</mo>
<mi>c</mi>
<mo>)</mo>
</mrow>
</mrow>
<mo>∧</mo>
<mrow>
<mi>factorof</mi>
<mo>⁡</mo>
<mrow>
<mo>(</mo>
<mi>b</mi>
<mo>,</mo>
<mi>c</mi>
<mo>)</mo>
</mrow>
</mrow>
<mo>∧</mo>
<mrow>
<mi>c</mi>
<mo><</mo>
<mrow>
<mi>lcm</mi>
<mo>⁡</mo>
<mrow>
<mo>(</mo>
<mi>a</mi>
<mo>,</mo>
<mi>b</mi>
<mo>)</mo>
</mrow>
</mrow>
</mrow>
</mrow>
</mrow>
</mrow>
</mrow>
</math>
</div>
</div>
</div>
</dd>
</dl>
<dl>
<dt>
<span class="dt">Signatures:</span>
</dt>
<dd>
<a href="../../sts/arith1.html#lcm">
sts
</a>
</dd>
</dl>
<p/>
<hr/>
<table width="100%">
<tr>
<td align="right">
<font size="-1">
[Next: <a href="#gcd">gcd</a>]
[Last: <a href="#product">product</a>]
[<a href="#top">Top</a>]</font>
</td>
</tr>
</table>
<hr/>
<h2>
<a name="gcd">gcd</a>
</h2>
<dl>
<dt>
<span class="dt">Role:</span>
</dt>
<dd>application</dd>
</dl>
<dl>
<dt>
<span class="dt">Description:</span>
</dt>
<dd>
<p>
The symbol to represent the n-ary function to return the gcd (greatest
common divisor) of its arguments.
</p>
</dd>
</dl>
<dl>
<dt>
<span class="dt">Commented Mathematical property (CMP):</span>
</dt>
<dd>
for all integers a,b |
There does not exist a c such that a/c is an Integer and b/c is an
Integer and c > gcd(a,b).
Note that this implies that gcd(a,b) > 0
</dd>
</dl>
<dl>
<dt>
<span class="dt">Formal Mathematical property (FMP):</span>
</dt>
<dd>
<div>
<button id="id.om.85xmla" style="width:20em; background-color:#CCCCCC"
onclick="divfold('id.om.85xml')">OpenMath XML (source)</button>
<pre id="id.om.85xml" style="display:none">
<OMOBJ xmlns="http://www.openmath.org/OpenMath" version="2.0" cdbase="http://www.openmath.org/cd">
<OMBIND>
<OMS cd="quant1" name="forall"/>
<OMBVAR>
<OMV name="a"/>
<OMV name="b"/>
</OMBVAR>
<OMA>
<OMS cd="logic1" name="implies"/>
<OMA>
<OMS cd="logic1" name="and"/>
<OMA>
<OMS cd="set1" name="in"/>
<OMV name="a"/>
<OMS cd="setname1" name="Z"/>
</OMA>
<OMA>
<OMS cd="set1" name="in"/>
<OMV name="b"/>
<OMS cd="setname1" name="Z"/>
</OMA>
</OMA>
<OMA>
<OMS cd="logic1" name="not"/>
<OMBIND>
<OMS cd="quant1" name="exists"/>
<OMBVAR>
<OMV name="c"/>
</OMBVAR>
<OMA>
<OMS cd="logic1" name="and"/>
<OMA>
<OMS cd="set1" name="in"/>
<OMA>
<OMS cd="arith1" name="divide"/>
<OMV name="a"/>
<OMV name="c"/>
</OMA>
<OMS cd="setname1" name="Z"/>
</OMA>
<OMA>
<OMS cd="set1" name="in"/>
<OMA>
<OMS cd="arith1" name="divide"/>
<OMV name="b"/>
<OMV name="c"/>
</OMA>
<OMS cd="setname1" name="Z"/>
</OMA>
<OMA>
<OMS cd="relation1" name="gt"/>
<OMV name="c"/>
<OMA>
<OMS cd="arith1" name="gcd"/>
<OMV name="a"/>
<OMV name="b"/>
</OMA>
</OMA>
</OMA>
</OMBIND>
</OMA>
</OMA>
</OMBIND>
</OMOBJ></pre>
</div>
<div>
<button id="id.om.85cmmla" style="width:20em; background-color:#CCCCCC"
onclick="divfold('id.om.85cmml')">Strict Content MathML</button>
<pre id="id.om.85cmml" style="display:none; margin-top: 0.5em">
<math xmlns="http://www.w3.org/1998/Math/MathML">
<bind><csymbol cd="quant1">forall</csymbol>
<bvar><ci>a</ci></bvar>
<bvar><ci>b</ci></bvar>
<apply><csymbol cd="logic1">implies</csymbol>
<apply><csymbol cd="logic1">and</csymbol>
<apply><csymbol cd="set1">in</csymbol><ci>a</ci><csymbol cd="setname1">Z</csymbol></apply>
<apply><csymbol cd="set1">in</csymbol><ci>b</ci><csymbol cd="setname1">Z</csymbol></apply>
</apply>
<apply><csymbol cd="logic1">not</csymbol>
<bind><csymbol cd="quant1">exists</csymbol>
<bvar><ci>c</ci></bvar>
<apply><csymbol cd="logic1">and</csymbol>
<apply><csymbol cd="set1">in</csymbol>
<apply><csymbol cd="arith1">divide</csymbol><ci>a</ci><ci>c</ci></apply>
<csymbol cd="setname1">Z</csymbol>
</apply>
<apply><csymbol cd="set1">in</csymbol>
<apply><csymbol cd="arith1">divide</csymbol><ci>b</ci><ci>c</ci></apply>
<csymbol cd="setname1">Z</csymbol>
</apply>
<apply><csymbol cd="relation1">gt</csymbol>
<ci>c</ci>
<apply><csymbol cd="arith1">gcd</csymbol><ci>a</ci><ci>b</ci></apply>
</apply>
</apply>
</bind>
</apply>
</apply>
</bind>
</math></pre>
</div>
<button id="id.om.85prefa" style="width:20em; background-color:#CCCCCC"
onclick="divfold('id.om.85pref')">Prefix</button>
<div id="id.om.85pref" style="display:none; margin-top: 0.5em">
<a href="../../../cd/quant1.html#forall">forall</a>
[
<i>a</i>
<i>b</i>
] .
(<a href="../../../cd/logic1.html#implies">implies</a>
(<a href="../../../cd/logic1.html#and">and</a>
(<a href="../../../cd/set1.html#in">in</a>
( <i>a</i>, <a href="../../../cd/setname1.html#Z">Z</a>)
, <a href="../../../cd/set1.html#in">in</a>
( <i>b</i>, <a href="../../../cd/setname1.html#Z">Z</a>)
)
, <a href="../../../cd/logic1.html#not">not</a>
(<a href="../../../cd/quant1.html#exists">exists</a>
[
<i>c</i>
] .
(<a href="../../../cd/logic1.html#and">and</a>
(<a href="../../../cd/set1.html#in">in</a>
(<a href="../../../cd/arith1.html#divide">divide</a>
( <i>a</i>, <i>c</i>)
, <a href="../../../cd/setname1.html#Z">Z</a>)
, <a href="../../../cd/set1.html#in">in</a>
(<a href="../../../cd/arith1.html#divide">divide</a>
( <i>b</i>, <i>c</i>)
, <a href="../../../cd/setname1.html#Z">Z</a>)
, <a href="../../../cd/relation1.html#gt">gt</a>
( <i>c</i>, <a href="../../../cd/arith1.html#gcd">gcd</a>
( <i>a</i>, <i>b</i>)
)
)
)
)
)
)
</div>
<div>
<button id="id.om.85popa" style="width:20em; background-color:#CCCCCC"
onclick="divfold('id.om.85pop')">Popcorn</button>
<div id="id.om.85pop" style="display:none; margin-top: 0.5em">
quant1.forall[$a, $b -> set1.in($a, setname1.Z) and set1.in($b, setname1.Z) ==> not(quant1.exists[$c -> set1.in($a / $c, setname1.Z) and set1.in($b / $c, setname1.Z) and $c > arith1.gcd($a, $b)])]
</div>
</div>
<div>
<button id="id.om.85mmla" style="width:20em; background-color:#AAFFAA"
onclick="divfold('id.om.85mml')">Rendered Presentation MathML</button>
<div id="id.om.85mml" style="display:block; margin-top: 0.5em">
<div style="overflow:auto;font-size:90%">
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
<mrow xmlns:om="http://www.openmath.org/OpenMath">
<mo>∀</mo>
<mo> </mo>
<mrow>
<mi>a</mi>
<mo>,</mo>
<mi>b</mi>
</mrow>
<mo>.</mo>
<mrow>
<mrow>
<mrow>
<mi>a</mi>
<mo>∈</mo>
<mi mathvariant="double-struck">Z</mi>
</mrow>
<mo>∧</mo>
<mrow>
<mi>b</mi>
<mo>∈</mo>
<mi mathvariant="double-struck">Z</mi>
</mrow>
</mrow>
<mo>⇒</mo>
<mo>¬</mo>
<mrow>
<mo>∃</mo>
<mo> </mo>
<mrow>
<mi>c</mi>
</mrow>
<mo>.</mo>
<mrow>
<mrow>
<mfrac>
<mi>a</mi>
<mi>c</mi>
</mfrac>
<mo>∈</mo>
<mi mathvariant="double-struck">Z</mi>
</mrow>
<mo>∧</mo>
<mrow>
<mfrac>
<mi>b</mi>
<mi>c</mi>
</mfrac>
<mo>∈</mo>
<mi mathvariant="double-struck">Z</mi>
</mrow>
<mo>∧</mo>
<mrow>
<mi>c</mi>
<mo>></mo>
<mrow>
<mi>gcd</mi>
<mo>⁡</mo>
<mrow>
<mo>(</mo>
<mi>a</mi>
<mo>,</mo>
<mi>b</mi>
<mo>)</mo>
</mrow>
</mrow>
</mrow>
</mrow>
</mrow>
</mrow>
</mrow>
</math>
</div>
</div>
</div>
</dd>
</dl>
<dl>
<dt>
<span class="dt">Example:</span>
</dt>
<dd>
gcd(6,9) = 3
<div>
<button id="id.om.133xmla" style="width:20em; background-color:#CCCCCC"
onclick="divfold('id.om.133xml')">OpenMath XML (source)</button>
<pre id="id.om.133xml" style="display:none"><OMOBJ xmlns="http://www.openmath.org/OpenMath" version="2.0" cdbase="http://www.openmath.org/cd">
<OMA>
<OMS cd="relation1" name="eq"/>
<OMA>
<OMS cd="arith1" name="gcd"/>
<OMI> 6 </OMI>
<OMI> 9 </OMI>
</OMA>
<OMI> 3 </OMI>
</OMA>
</OMOBJ></pre>
</div>
<div>
<button id="id.om.133cmmla" style="width:20em; background-color:#CCCCCC"
onclick="divfold('id.om.133cmml')">Strict Content MathML</button>
<pre id="id.om.133cmml" style="display:none; margin-top: 0.5em">
<math xmlns="http://www.w3.org/1998/Math/MathML">
<apply><csymbol cd="relation1">eq</csymbol>
<apply><csymbol cd="arith1">gcd</csymbol>
<cn type="integer">6</cn>
<cn type="integer">9</cn>
</apply>
<cn type="integer">3</cn>
</apply>
</math></pre>
</div>
<button id="id.om.133prefa" style="width:20em; background-color:#CCCCCC"
onclick="divfold('id.om.133pref')">Prefix</button>
<div id="id.om.133pref" style="display:none; margin-top: 0.5em">
<a href="../../../cd/relation1.html#eq">eq</a>
(<a href="../../../cd/arith1.html#gcd">gcd</a>
( 6 , 9 )
, 3 )
</div>
<div>
<button id="id.om.133popa" style="width:20em; background-color:#CCCCCC"
onclick="divfold('id.om.133pop')">Popcorn</button>
<div id="id.om.133pop" style="display:none; margin-top: 0.5em">
arith1.gcd(6, 9) = 3
</div>
</div>
<div>
<button id="id.om.133mmla" style="width:20em; background-color:#AAFFAA"
onclick="divfold('id.om.133mml')">Rendered Presentation MathML</button>
<div id="id.om.133mml" style="display:block; margin-top: 0.5em">
<div style="overflow:auto;font-size:90%">
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
<mrow xmlns:om="http://www.openmath.org/OpenMath">
<mrow>
<mi>gcd</mi>
<mo>⁡</mo>
<mrow>
<mo>(</mo>
<mn> 6 </mn>
<mo>,</mo>
<mn> 9 </mn>
<mo>)</mo>
</mrow>
</mrow>
<mo>=</mo>
<mn> 3 </mn>
</mrow>
</math>
</div>
</div>
</div>
</dd>
</dl>
<dl>
<dt>
<span class="dt">Signatures:</span>
</dt>
<dd>
<a href="../../sts/arith1.html#gcd">
sts
</a>
</dd>
</dl>
<p/>
<hr/>
<table width="100%">
<tr>
<td align="right">
<font size="-1">
[Next: <a href="#plus">plus</a>]
[Previous: <a href="#lcm">lcm</a>]
[<a href="#top">Top</a>]</font>
</td>
</tr>
</table>
<hr/>
<h2>
<a name="plus">plus</a>
</h2>
<dl>
<dt>
<span class="dt">Role:</span>
</dt>
<dd>application</dd>
</dl>
<dl>
<dt>
<span class="dt">Description:</span>
</dt>
<dd>
<p>
The symbol representing an n-ary commutative function plus.
</p>
</dd>
</dl>
<dl>
<dt>
<span class="dt">Commented Mathematical property (CMP):</span>
</dt>
<dd> for all a,b | a + b = b + a </dd>
</dl>
<dl>