Here: Relationship between homology of suspension of $X$ and $X$, Joe Moeller argued that $(\Sigma X\setminus U,C_-^n\setminus U)$ deformation retracts to $(C_+^n,X)$. I don't know the definition of deformation retracts of pairs, could someone tell me?
2026-04-01 16:27:09.1775060829
About deformation retract of pairs
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