{"version":"1.0","type":"link","title":"Phantom map - Newikis","description":"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 (1964) produced the first known nontrivial example of such a map with finite-dimensional (answering a…","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400}