hull — Mathlib

English

hull(T,a) is the intersection T ↓ ∩ {x | a ≤ x}, providing a hull in PrimitiveSpectrum.

Русский

hull(T,a) задаёт пересечение T↓ и {x | a ≤ x}, образуя оболочку в PrimitiveSpectrum.

LaTeX

$$$\\operatorname{hull}(T,a) = T\\downarrow \\cap \\{x : a \\le x\\}$$$

Lean4

/-- For `a` of type `α` the set of element of `T` which dominate `a` is the `hull` of `a` in `T`. -/
abbrev hull (T : Set α) (a : α) :=
  T ↓∩ Ici a

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