Portal:Mathematics/Featured picture/2006 11

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{{Portal:Mathematics/box-header|Picture of the month|{{FULLPAGENAME}}}}

{{Portal:Mathematics/Feature picture|img=KleinBottle-01.png|more=Klein bottle|user=Fropuff|desc=A Klein bottle, an example of a surface that is non-orientable — one with no distinction between the "inside" and "outside".|class={{{class}}}}}

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