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Related theorems GIF version |
| Description: Version of dveel2 1357 using ax-16 1210 instead of ax-17 971. |
| Ref | Expression |
|---|---|
| dveel2ALT | ⊢ (¬ ∀x x = y → (z ∈ y → ∀x z ∈ y)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax17el 1361 | . 2 ⊢ (z ∈ w → ∀x z ∈ w) | |
| 2 | ax17el 1361 | . 2 ⊢ (z ∈ y → ∀w z ∈ y) | |
| 3 | elequ2 1137 | . 2 ⊢ (w = y → (z ∈ w ↔ z ∈ y)) | |
| 4 | 1, 2, 3 | dvelimfALT 1153 | 1 ⊢ (¬ ∀x x = y → (z ∈ y → ∀x z ∈ y)) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 2 → wi 3 ∀wal 954 = wceq 956 ∈ wcel 958 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 962 ax-gen 963 ax-8 964 ax-10 966 ax-12 968 ax-14 970 ax-4 973 ax-5o 975 ax-6o 978 ax-9o 1123 ax-10o 1140 ax-16 1210 ax-15 1360 |
| This theorem depends on definitions: df-bi 147 df-an 225 |