The characterization conjecture for local LS-category and cocategory

Let XX be a space and let n>2n>2. Define LS2(X)n2LS_2(X)\leq n-2 when XX has Lusternik–Schnirelmann category at most nn and admits an open cover U1,,UnU_1,\ldots,U_n such that each map UiUjXU_i\cup U_j\to X is null homotopic for distinct i,ji,j. Dually, define LS2op(X)n2LS^{op}_2(X)\leq n-2 when XX has Lusternik–Schnirelmann cocategory at most nn and satisfies the corresponding co-cover condition. Let (Tn)2I(X)(\mathrm{T}^n)^2\mathbb{I}(X) and Tn2I(X)\mathrm{T}_n^2\mathbb{I}(X) denote the second iterates of the covariant and contravariant approximation constructions on the identity functor. Characterization conjecture. The following equivalences should hold: (1) XX has LS2(X)n2LS_2(X)\leq n-2 if and only if the map (Tn)2I(X)X(\mathrm{T}^n)^2\mathbb{I}(X)\to X has a section; (2) XX has LS2op(X)n2LS^{op}_2(X)\leq n-2 if and only if XX is a retract of Tn2I(X)\mathrm{T}_n^2\mathbb{I}(X). These would characterize the local LS invariants through the second stages of the dual Goodwillie constructions; the source presents them as a conjectural characterization and gives no resolution.

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Primary source

Rosona Eldred, “Goodwillie Calculus via Adjunction and LS Cocategory”, arXiv:1209.2384 (2015).

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