Description: If a class is a member of another class, then it is a set. Deduction associated with elex . (Contributed by Glauco Siliprandi, 11-Oct-2020)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | elexd.1 | ⊢ ( 𝜑 → 𝐴 ∈ 𝑉 ) | |
| Assertion | elexd | ⊢ ( 𝜑 → 𝐴 ∈ V ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elexd.1 | ⊢ ( 𝜑 → 𝐴 ∈ 𝑉 ) | |
| 2 | elex | ⊢ ( 𝐴 ∈ 𝑉 → 𝐴 ∈ V ) | |
| 3 | 1 2 | syl | ⊢ ( 𝜑 → 𝐴 ∈ V ) |