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Mirrors > Home > ILE Home > Th. List > moaneu | GIF version |
Description: Nested "at most one" and uniqueness quantifiers. (Contributed by NM, 25-Jan-2006.) |
Ref | Expression |
---|---|
moaneu | ⊢ ∃*𝑥(𝜑 ∧ ∃!𝑥𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eumo 1932 | . . 3 ⊢ (∃!𝑥𝜑 → ∃*𝑥𝜑) | |
2 | nfeu1 1911 | . . . 4 ⊢ Ⅎ𝑥∃!𝑥𝜑 | |
3 | 2 | moanim 1974 | . . 3 ⊢ (∃*𝑥(∃!𝑥𝜑 ∧ 𝜑) ↔ (∃!𝑥𝜑 → ∃*𝑥𝜑)) |
4 | 1, 3 | mpbir 134 | . 2 ⊢ ∃*𝑥(∃!𝑥𝜑 ∧ 𝜑) |
5 | ancom 253 | . . 3 ⊢ ((𝜑 ∧ ∃!𝑥𝜑) ↔ (∃!𝑥𝜑 ∧ 𝜑)) | |
6 | 5 | mobii 1937 | . 2 ⊢ (∃*𝑥(𝜑 ∧ ∃!𝑥𝜑) ↔ ∃*𝑥(∃!𝑥𝜑 ∧ 𝜑)) |
7 | 4, 6 | mpbir 134 | 1 ⊢ ∃*𝑥(𝜑 ∧ ∃!𝑥𝜑) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 97 ∃!weu 1900 ∃*wmo 1901 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 |
This theorem depends on definitions: df-bi 110 df-tru 1246 df-nf 1350 df-sb 1646 df-eu 1903 df-mo 1904 |
This theorem is referenced by: (None) |
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