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Mirrors > Home > ILE Home > Th. List > ax4sp1 | GIF version |
Description: A special case of ax-4 1440 without using ax-4 1440 or ax-17 1459. (Contributed by NM, 13-Jan-2011.) |
Ref | Expression |
---|---|
ax4sp1 | ⊢ (∀𝑦 ¬ 𝑥 = 𝑥 → ¬ 𝑥 = 𝑥) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | equidqe 1465 | . 2 ⊢ ¬ ∀𝑦 ¬ 𝑥 = 𝑥 | |
2 | 1 | pm2.21i 607 | 1 ⊢ (∀𝑦 ¬ 𝑥 = 𝑥 → ¬ 𝑥 = 𝑥) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 ∀wal 1282 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-5 1376 ax-gen 1378 ax-ie2 1423 ax-8 1435 ax-i9 1463 |
This theorem depends on definitions: df-bi 115 df-tru 1287 df-fal 1290 |
This theorem is referenced by: (None) |
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