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Mirrors > Home > MPE Home > Th. List > Mathboxes > exlimexi | Structured version Visualization version GIF version |
Description: Inference similar to Theorem 19.23 of [Margaris] p. 90. (Contributed by Alan Sare, 21-Apr-2013.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
exlimexi.1 | ⊢ (𝜓 → ∀𝑥𝜓) |
exlimexi.2 | ⊢ (∃𝑥𝜑 → (𝜑 → 𝜓)) |
Ref | Expression |
---|---|
exlimexi | ⊢ (∃𝑥𝜑 → 𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | hbe1 2144 | . . 3 ⊢ (∃𝑥𝜑 → ∀𝑥∃𝑥𝜑) | |
2 | exlimexi.1 | . . 3 ⊢ (𝜓 → ∀𝑥𝜓) | |
3 | exlimexi.2 | . . 3 ⊢ (∃𝑥𝜑 → (𝜑 → 𝜓)) | |
4 | 1, 2, 3 | exlimdh 2294 | . 2 ⊢ (∃𝑥𝜑 → (∃𝑥𝜑 → 𝜓)) |
5 | 4 | pm2.43i 52 | 1 ⊢ (∃𝑥𝜑 → 𝜓) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∀wal 1536 ∃wex 1781 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-10 2142 ax-12 2175 |
This theorem depends on definitions: df-bi 210 df-ex 1782 df-nf 1786 |
This theorem is referenced by: sb5ALT 41231 exinst 41330 |
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