Phantom map
id:
phantom-map-302-18043158
title:
Phantom map
text:
In homotopy theory, phantom maps are continuous maps f : X → Y of CW-complexes for which the restriction of f to any finite subcomplex Z ⊂ X is inessential. J. Frank Adams and Grant Walker (1964) produced the first known nontrivial example of such a map with Y finite-dimensional. Shortly thereafter, the terminology of "phantom map" was coined by Brayton Gray (1966), who constructed a stably essential phantom map from infinite-dimensional complex projective space to S 3 . The subject was analysed
brand slug:
wiki
category slug:
encyclopedia
description:
original url:
https://en.wikipedia.org/wiki/Phantom_map
date created:
date modified:
2023-12-21T23:50:10Z
main entity:
{"identifier":"Q7180612","url":"https://www.wikidata.org/entity/Q7180612"}
image:
fields total:
13
integrity:
13