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Metamath Proof Explorer

Theorem difexi

Description: Existence of a difference, inference version of difexg . (Contributed by Glauco Siliprandi, 3-Mar-2021) (Revised by AV, 26-Mar-2021)

Ref Expression
Hypothesis difexi.1 ⊢ A ∈ V
Assertion difexi ⊢ A ∖ B ∈ V

Proof

Step Hyp Ref Expression
1 difexi.1 ⊢ A ∈ V
2 difexg ⊢ A ∈ V → A ∖ B ∈ V
3 1 2 ax-mp ⊢ A ∖ B ∈ V