Metamath Proof Explorer


Theorem termccatd

Description: A terminal category is a category (deduction form). (Contributed by Zhi Wang, 16-Oct-2025)

Ref Expression
Hypothesis termcthind.c ⊢ ( 𝜑 → 𝐶 ∈ TermCat )
Assertion termccatd ( 𝜑 → 𝐶 ∈ Cat )

Proof

Step Hyp Ref Expression
1 termcthind.c ⊢ ( 𝜑 → 𝐶 ∈ TermCat )
2 1 termcthind ⊢ ( 𝜑 → 𝐶 ∈ ThinCat )
3 2 thinccatd ⊢ ( 𝜑 → 𝐶 ∈ Cat )