In homotopy theory, phantom maps are continuous maps of CW-complexes for which the restriction of to any finite subcomplex is inessential (i.e., nullhomotopic). J. Frank Adams and Grant Walker produced the first known nontrivial example of such a map with finite-dimensional (answering a question of Paul Olum). Shortly thereafter, the terminology of "phantom map" was coined by Brayton Gray, who constructed a stably essential phantom map from infinite-dimensional complex projective space to . The subject was analysed in the thesis of Gray, much of which was elaborated and later published in (Gray & McGibbon ). Similar constructions are defined for maps of spectra. (Wikipedia).
Pirate Treasure of the Knights Templar: Finding an Ancient Tea Cup (S1, E5) | History
Team historian Chris describes his discovery of an ancient porcelain tea cup in the Fiery Dragon wreckage in this web exclusive from "The Flaming Cross." Subscribe for more from Pirate Treasure of the Knights Templar and other great HISTORY shows: http://histv.co/SubscribeHistoryYT Find
From playlist Pirate Treasure of the Knights Templar | History
Titanic and Technology | History
During the early 20th century boom in construction, communication and transportation, the tragedy of the Titanic shocks the world and leaves in its wake a shattered faith in technology. #HistoryChannel Subscribe for more HISTORY: http://histv.co/SubscribeHistoryYT Check out exclusive HIST
From playlist Titanic | History
Pirate Treasure of the Knights Templar: The Pirate Island Anomaly (S1, E6) | History
Chris and Barry are excited about the findings of a team of Spanish geologists in this web exclusive from "Treasure Island." Subscribe for more from Pirate Treasure of the Knights Templar and other great HISTORY shows: http://histv.co/SubscribeHistoryYT Find out more about the show on ou
From playlist Pirate Treasure of the Knights Templar | History
Can you still feel a limb that's gone? - Joshua W. Pate
Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/the-fascinating-science-of-phantom-limbs-joshua-w-pate The vast majority of people who’ve lost a limb can still feel it — not as a memory or vague shape, but in complete lifelike detail
From playlist New TED-Ed Originals
The Disappearance of Flight 19 | Atlas of Cursed Places
The Bermuda Triangle is believed to be a mysterious and cursed region of the world by many. The disappearance of Flight 19 in 1945 was one of the aviation events that cemented the curse of Bermuda Triangle in the minds of many. ➡ Subscribe: http://bit.ly/NatGeoSubscribe About National Geo
From playlist Newest Clips | National Geographic
On descending cohomology geometrically - Sebastian Casalaina-Martin
Sebastian Casalaina-Martin University of Colorado at Boulder January 20, 2015 In this talk I will present some joint work with Jeff Achter concerning the problem of determining when the cohomology of a smooth projective variety over the rational numbers can be modeled by an abelian variet
From playlist Mathematics
Bet You Didn't Know: Halloween | History
It's one of America's favorite holidays, but what's the real story behind the tricks and treats of Halloween? #HistoryChannel Subscribe for more History: http://histv.co/SubscribeHistoryYT Check out exclusive HISTORY videos and full episodes: http://www.history.com/videos Get daily updat
From playlist Haunted History
The World Wars: Winston Churchill | History
Mini-biography on the life of Winston Churchill. Subscribe for more History: http://histv.co/SubscribeHistoryYT Check out exclusive HISTORY videos and full episodes: http://www.history.com/videos Get daily updates on history: http://www.history.com/news/ Check out our Facebook games,
From playlist War & Battle | History
Bob Lee, CTO Square, Inc. talks about the Java community
Bob Lee, CTO of Square, interviewed here by O'Reilly Media at Oracle's OpenWorld/JavaOne 2011 discusses his talk on Java references and his general thoughts on the direction and health of the Java community.
From playlist Java for Radar
Deep Learning Approaches in Inverse Problems (Lecture 2) by Deep Ray
DISCUSSION MEETING WORKSHOP ON INVERSE PROBLEMS AND RELATED TOPICS (ONLINE) ORGANIZERS: Rakesh (University of Delaware, USA) and Venkateswaran P Krishnan (TIFR-CAM, India) DATE: 25 October 2021 to 29 October 2021 VENUE: Online This week-long program will consist of several lectures by
From playlist Workshop on Inverse Problems and Related Topics (Online)
Hands-On with DJI's Inspire 1 Quadcopter!
DJI's new quadcopter is one of the coolest we've seen--a huge upgrade from the current Phantom 2 Vision+ we've been using. The Inspire 1 can record 4K video, lifts its propeller struts, and transmit clear HD video to the pilot. We chat in-depth with Eric Cheng, DJI's Director of Aerial Ima
From playlist Hardware Reviews
Hands-On with DJI's Phantom 3 Professional Quadcopter Drone!
We take the new DJI Phantom 3 Advanced and Professional quadcopters out for some test flights! Eric Cheng of DJI joins us to discuss how these new quads differ from previous models in terms of their flight capability and cameras, bringing in features previously introduced in the Inspire 1
From playlist Hardware Reviews
Quantum Topological Data Analysis (Part 1) [Péguy Kem-Meka]
Quantum Topological Data Analysis is about how quantum computers and quantum information processors can learn pattern in data that cannot be learn by classical TDA algorithms. Quantum computers are becoming available to general public. They can dramatically reduce both execution time and e
From playlist Tutorials
Pirate Treasure of the Knights Templar: Possible Templar Markings in Madagascar (S1, E5) | History
Scott examines cryptic markings in Madagascar that are said to be Templar code in this scene from "The Flaming Cross." Subscribe for more from Pirate Treasure of the Knights Templar and other great HISTORY shows: http://histv.co/SubscribeHistoryYT Find out more about the show on our site
From playlist Pirate Treasure of the Knights Templar | History
Dan Work: "Traffic Flow Smoothing at scale"
Mathematical Challenges and Opportunities for Autonomous Vehicles 2020 Workshop II: Safe Operation of Connected and Autonomous Vehicle Fleets "Traffic Flow Smoothing at scale" Daniel Work - Vanderbilt University Abstract: This talk will discuss modeling, simulation, and field demonstrati
From playlist Mathematical Challenges and Opportunities for Autonomous Vehicles 2020
Titanic's Achilles Heel | History
Weighing the evidence and first hand accounts, a team of researchers attempts to discover the causes and truth behind the wrecks of the Titanic and the Britannic. #HistoryChannel Subscribe for more HISTORY: http://histv.co/SubscribeHistoryYT Check out exclusive HISTORY videos and full epi
From playlist Titanic | History
How Fish Eat Part 2 (SLOW MOTION UNDERWATER!) - Smarter Every Day 119
Tweet⇒ http://bit.ly/FishEat2TWT FB⇒ http://bit.ly/FishEat2FB Footage by - www.biopixel.tv Filmed at - www.jcu.edu.au Official comment thread on Reddit here: http://bit.ly/1pMCPEf Shot with a Phantom Miro Camera http://bit.ly/NewPhantomMiro More info! ⇊ Click below for more links! ⇊
From playlist Great Barrier Reef - Deep Dive
Travel to a Paradise Island, Frozen in Time | National Geographic
The Island of Mozambique was spared from the ravages of modern development during the 20th century. ➡ Subscribe: http://bit.ly/NatGeoSubscribe About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-cla
From playlist News | National Geographic
Deconstructing History: Titanic | History
Everyone knows the Titanic was big, and we have the hard numbers to prove it. Discover what made it a supersized ship. Check out exclusive HISTORY videos and full episodes: http://www.history.com/videos Get daily updates on history: http://www.history.com/news/ Get the latest on show pr
From playlist Titanic | History
How Fish Eat (in SLOW MOTION!) - Smarter Every Day 118
Free Audio Book ⇒ http://bit.ly/AudibleSED Tweet⇒ http://bit.ly/FishEatTWT FB⇒ http://bit.ly/FishEatFB Official comment thread on Reddit here: http://bit.ly/1mauG9g Shot with a Phantom Miro Camera http://bit.ly/NewPhantomMiro More info! ⇊ Click below for more links! ⇊ I shot the fis
From playlist Great Barrier Reef - Deep Dive