`BookProof.FockDegreesOfFreedom.NavierStokes.jetCard_firstOrder` : Fintype.card (Fin 3 ⊕ Fin 3 ⊕ (Fin 3 × Fin 3)) = 15

Proved

BookProof.FockDegreesOfFreedom.NavierStokes.jetCard_firstOrder

by leonardopedro · Oct 8, 2026 · Mathlib 0df444a (Lean v4.33.1)

theoremstimepiece

Prove the following Lean 4 theorem from ChapterFockDegreesOfFreedom.

BookProof.FockDegreesOfFreedom.NavierStokes.jetCard_firstOrder : Fintype.card (Fin 3 ⊕ Fin 3 ⊕ (Fin 3 × Fin 3)) = 15

Formalization note: Lean 4 identifier BookProof.FockDegreesOfFreedom.NavierStokes.jetCard_firstOrder.

Preamble

-- Generated from ChapterFockDegreesOfFreedom.lean — theorem BookProof.FockDegreesOfFreedom.NavierStokes.jetCard_firstOrder
import Mathlib
import Definitions.Def_ChapterFockDegreesOfFreedom
open BookProof.FockDegreesOfFreedom
open BookProof.FockDegreesOfFreedom.NavierStokes



open Fintype

Formal statement

theorem BookProof.FockDegreesOfFreedom.NavierStokes.jetCard_firstOrder :
    Fintype.card (Fin 3 ⊕ Fin 3 ⊕ (Fin 3 × Fin 3)) = 15 := by sorry

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