Hypergraphs | Discrete geometry | Families of sets
In combinatorics, a Helly family of order k is a family of sets in which every minimal subfamily with an empty intersection has k or fewer sets in it. Equivalently, every finite subfamily such that every k-fold intersection is non-empty has non-empty total intersection. The k-Helly property is the property of being a Helly family of order k. The number k is frequently omitted from these names in the case that k = 2. Thus, a set-family has the Helly property if, for every n sets in the family, if , then . These concepts are named after Eduard Helly (1884–1943); Helly's theorem on convex sets, which gave rise to this notion, states that convex sets in Euclidean space of dimension n are a Helly family of order n + 1. (Wikipedia).
How many people are in hell? | Bishop Robert Barron
This interview is an episode from The Well, our new publication about ideas that inspire a life well-lived, created with the John Templeton Foundation. Subscribe to The Well on YouTube ► https://bit.ly/thewell-youtube Up Next ► 3 arguments against God, explained by a Catholic bishop https
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The Harlem Hellfighters | History
The Harlem Hellfighters were an African-American infantry unit in WWI who spent more time in combat than any other American unit. #HistoryChannel Subscribe for more History: http://histv.co/SubscribeHistoryYT Check out exclusive HISTORY videos and full episodes: http://www.history.com/vid
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Hadoop Interview Questions And Answers Part-2 | Big Data Interview Questions & Answers | Simplilearn
In this part-2 video of Hadoop Interview questions and answers, you will get an idea about the different questions you could face on Hive, Pig, HBase and Sqoop. It covers questions based on the architecture of these tools, how they work, and the various components present in it. You will a
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Go behind the scenes and on the set of National Geographic’s new scripted series, The Long Road Home. Hear from the real soldiers and families and see how the events of Black Sunday are being brought to life thirteen years later. ➡ Subscribe: http://bit.ly/NatGeoSubscribe ➡ Get More The Lo
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Outlaw Chronicles: Hells Angels: The Ideal Old Lady | History
George Christie outlines the importance of women to the Hells Angels organization in this web exclusive. Subscribe for more from Outlaw Chronicles: Hells Angels and other great HISTORY shows: http://histv.co/SubscribeHistoryYT Find out more about the show and the George Christie on our s
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