shows an open interval around the number <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle a}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mi>a</mi></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle a}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ffd2487510aa438433a2579450ab2b3d557e5edc" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -0.338ex; width:1.23ex; height:1.676ex;" alt="a"></span>
<ul><li><a href="//commons.wikimedia.org/wiki/File:Konvergenz.svg" title="File:Konvergenz.svg">Konvergenz.svg</a>: Matthias Vogelgesang (<a href="//commons.wikimedia.org/w/index.php?title=User:Youthenergy&amp;action=edit&amp;redlink=1" class="new" title="User:Youthenergy (page does not exist)">Youthenergy</a>)</li>
<li>derivative work: <a rel="nofollow" class="external text" href="http://kulla.me/">Stephan Kulla</a> (<a href="//commons.wikimedia.org/wiki/User:Stephan_Kulla" title="User:Stephan Kulla">User:Stephan Kulla</a>)</li></ul>
CC BY-SA 3.0
<ul><li><a href="//commons.wikimedia.org/wiki/File:Konvergenz.svg" title="File:Konvergenz.svg">Konvergenz.svg</a></li></ul>