Postnikov System
An iterated fibration of Eilenberg-Mac lane spaces. Every topological space has this homotopy type.
See also
Eilenberg-Mac Lane Space, Fibration, HomotopyExplore with Wolfram|Alpha
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Cite this as:
Weisstein, Eric W. "Postnikov System." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/PostnikovSystem.html