 ##  [Steiner Porism](/steiner-porism) 

  ##  [Steiner Porism](https://puremath.quantumdictionary.io/steiner-porism-0) 

  
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- Mathematics &amp; Logic -

**Pure Mathematics Dictionary**

 
Definition

A classical porism about two nonintersecting circles (an annulus) stating that if there exists a closed chain of n pairwise tangent circles inscribed between the two given circles for one choice of a starting circle, then such a closed chain exists for every choice of starting circle in the annular region.