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| Mirrors > Home > ILE Home > Th. List > rexuz | GIF version | ||
| Description: Restricted existential quantification in an upper set of integers. (Contributed by NM, 9-Sep-2005.) |
| Ref | Expression |
|---|---|
| rexuz | ⊢ (𝑀 ∈ ℤ → (∃𝑛 ∈ (ℤ≥‘𝑀)𝜑 ↔ ∃𝑛 ∈ ℤ (𝑀 ≤ 𝑛 ∧ 𝜑))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eluz1 9659 | . . . 4 ⊢ (𝑀 ∈ ℤ → (𝑛 ∈ (ℤ≥‘𝑀) ↔ (𝑛 ∈ ℤ ∧ 𝑀 ≤ 𝑛))) | |
| 2 | 1 | anbi1d 465 | . . 3 ⊢ (𝑀 ∈ ℤ → ((𝑛 ∈ (ℤ≥‘𝑀) ∧ 𝜑) ↔ ((𝑛 ∈ ℤ ∧ 𝑀 ≤ 𝑛) ∧ 𝜑))) |
| 3 | anass 401 | . . 3 ⊢ (((𝑛 ∈ ℤ ∧ 𝑀 ≤ 𝑛) ∧ 𝜑) ↔ (𝑛 ∈ ℤ ∧ (𝑀 ≤ 𝑛 ∧ 𝜑))) | |
| 4 | 2, 3 | bitrdi 196 | . 2 ⊢ (𝑀 ∈ ℤ → ((𝑛 ∈ (ℤ≥‘𝑀) ∧ 𝜑) ↔ (𝑛 ∈ ℤ ∧ (𝑀 ≤ 𝑛 ∧ 𝜑)))) |
| 5 | 4 | rexbidv2 2510 | 1 ⊢ (𝑀 ∈ ℤ → (∃𝑛 ∈ (ℤ≥‘𝑀)𝜑 ↔ ∃𝑛 ∈ ℤ (𝑀 ≤ 𝑛 ∧ 𝜑))) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 ∈ wcel 2177 ∃wrex 2486 class class class wbr 4047 ‘cfv 5276 ≤ cle 8115 ℤcz 9379 ℤ≥cuz 9655 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-14 2180 ax-ext 2188 ax-sep 4166 ax-pow 4222 ax-pr 4257 ax-cnex 8023 ax-resscn 8024 |
| This theorem depends on definitions: df-bi 117 df-3or 982 df-3an 983 df-tru 1376 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ral 2490 df-rex 2491 df-rab 2494 df-v 2775 df-sbc 3000 df-un 3171 df-in 3173 df-ss 3180 df-pw 3619 df-sn 3640 df-pr 3641 df-op 3643 df-uni 3853 df-br 4048 df-opab 4110 df-mpt 4111 df-id 4344 df-xp 4685 df-rel 4686 df-cnv 4687 df-co 4688 df-dm 4689 df-iota 5237 df-fun 5278 df-fv 5284 df-ov 5954 df-neg 8253 df-z 9380 df-uz 9656 |
| This theorem is referenced by: (None) |
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