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<div style="position:fixed;left:0;top:0">
[[File:coinslot.png|link=]]
</div>
<div style="top: 300px; left: 0px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 600px; left: 0px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 900px; left: 0px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 1200px; left: 0px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 0px; left: 400px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 300px; left: 400px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 600px; left: 400px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 900px; left: 400px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 1200px; left: 400px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 0px; left: 800px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 300px; left: 800px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 600px; left: 800px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 900px; left: 800px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 1200px; left: 800px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 0px; left: 1200px; position: fixed; float: left;">
[[File:Cobson.png|link=]]
</div>
<div style="top: 300px; left: 1200px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 600px; left: 1200px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 900px; left: 1200px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 1200px; left: 1200px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
The cofinality of an [[ordinal]] \(\alpha\), denoted \(\mathrm{cof}(\alpha)\) or \(\mathrm{cf}(\alpha)\), is the least \(\mu\) so that there is some function \(f: \mu \to \alpha\) with unbounded range. For example:
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