https://en.wikipedia.org/wiki/Neighbourhood_(mathematics)#In_a_metric_space ,
https://www.google.ca/search?q=triangular+ufo&espv=2&biw=1920&bih=971&source=lnms&tbm=isch&sa=X&ei=TeCTVcObFMjboAStmYWoCQ&sqi=2&ved=0CAYQ_AUoAQ ,
http://www.rense.com/general51/tri.htm ,
https://www.google.ca/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=triangular+ufo ,
http://www.rodsbot.com/?c=3798
https://en.wikipedia.org/wiki/Cylinder_set#General_definition
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