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Mirrors > Home > MPE Home > Th. List > equsb1ALT | Structured version Visualization version GIF version |
Description: Alternate version of equsb1 2529. (Contributed by NM, 10-May-1993.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
dfsb1.p4 | ⊢ (𝜃 ↔ ((𝑥 = 𝑦 → 𝑥 = 𝑦) ∧ ∃𝑥(𝑥 = 𝑦 ∧ 𝑥 = 𝑦))) |
Ref | Expression |
---|---|
equsb1ALT | ⊢ 𝜃 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfsb1.p4 | . . 3 ⊢ (𝜃 ↔ ((𝑥 = 𝑦 → 𝑥 = 𝑦) ∧ ∃𝑥(𝑥 = 𝑦 ∧ 𝑥 = 𝑦))) | |
2 | 1 | sb2ALT 2586 | . 2 ⊢ (∀𝑥(𝑥 = 𝑦 → 𝑥 = 𝑦) → 𝜃) |
3 | id 22 | . 2 ⊢ (𝑥 = 𝑦 → 𝑥 = 𝑦) | |
4 | 2, 3 | mpg 1797 | 1 ⊢ 𝜃 |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 ∃wex 1779 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-12 2176 ax-13 2389 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1780 |
This theorem is referenced by: sbieALT 2612 |
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