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date: 2022-04-08 00:11
modification date: Friday 8th April 2022 00:11:51
title: "Blakers Massey"
aliases: ["Blakers-Massey", "Blakers-Massey theorem"]
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- Tags: 
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- Refs:
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# Blakers Massey

Idea: the first obstruction to [homotopy excision](homotopy%20excision) for [relative homotopy groups](relative%20homotopy%20groups).
Generalizes [Freudenthal suspension](Freudenthal%20suspension)

![](attachments/Pasted%20image%2020220408001152.png)