Phantom map of spectra
= Phantom map of spectra
= Phantom maps of spectra
{synonym}
A <phantom map of spectra> is a stable map $p:D\to E$ with $pu=0$ for every map $u:F\to D$ from a <finite spectrum>. Such a map can be nonzero even though it induces zero on all <represented homology theories> on <based spaces>.