| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > ILE Home > Th. List > vex | GIF version | ||
| Description: All setvar variables are sets (see isset 2769). Theorem 6.8 of [Quine] p. 43. (Contributed by NM, 5-Aug-1993.) |
| Ref | Expression |
|---|---|
| vex | ⊢ 𝑥 ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | equid 1715 | . 2 ⊢ 𝑥 = 𝑥 | |
| 2 | df-v 2765 | . . 3 ⊢ V = {𝑥 ∣ 𝑥 = 𝑥} | |
| 3 | 2 | abeq2i 2307 | . 2 ⊢ (𝑥 ∈ V ↔ 𝑥 = 𝑥) |
| 4 | 1, 3 | mpbir 146 | 1 ⊢ 𝑥 ∈ V |
| Copyright terms: Public domain | W3C validator |