If `f` maps the product of the cells `C j` into `E₀`, and a point `a` of that product has `f a ∈ P` exactly when `a j ∈ Ev j (τ j)` for some `τ` with `σ = ∑ j, τ j`, then the trace of `f ⁻¹' (E₀ ∩ P)`

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If `f` maps the product of the cells `C j` into `E₀`, and a point `a` of that product has `f a ∈ P` exactly when `a j ∈ Ev j (τ j)` for some `τ` with `σ = ∑ j, τ j`, then the trace of `f ⁻¹' (E₀ ∩ P)` · Prove2Me