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Mirrors > Home > MPE Home > Th. List > Mathboxes > dveeq1-o16 | Structured version Visualization version GIF version |
Description: Version of dveeq1 2398 using ax-c16 36043 instead of ax-5 1911. (Contributed by NM, 29-Apr-2008.) TODO: Recover proof from older set.mm to remove use of ax-5 1911. (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
dveeq1-o16 | ⊢ (¬ ∀𝑥 𝑥 = 𝑦 → (𝑦 = 𝑧 → ∀𝑥 𝑦 = 𝑧)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax5eq 36083 | . 2 ⊢ (𝑤 = 𝑧 → ∀𝑥 𝑤 = 𝑧) | |
2 | ax5eq 36083 | . 2 ⊢ (𝑦 = 𝑧 → ∀𝑤 𝑦 = 𝑧) | |
3 | equequ1 2032 | . 2 ⊢ (𝑤 = 𝑦 → (𝑤 = 𝑧 ↔ 𝑦 = 𝑧)) | |
4 | 1, 2, 3 | dvelimh 2472 | 1 ⊢ (¬ ∀𝑥 𝑥 = 𝑦 → (𝑦 = 𝑧 → ∀𝑥 𝑦 = 𝑧)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∀wal 1535 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-10 2145 ax-11 2161 ax-12 2177 ax-13 2390 ax-c9 36041 ax-c16 36043 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 |
This theorem is referenced by: (None) |
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