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| Mirrors > Home > MPE Home > Th. List > npex | Structured version Visualization version GIF version | ||
| Description: The class of positive reals is a set. (Contributed by NM, 31-Oct-1995.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| npex | ⊢ P ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nqex 10989 | . . 3 ⊢ Q ∈ V | |
| 2 | 1 | pwex 5342 | . 2 ⊢ 𝒫 Q ∈ V |
| 3 | pssss 4046 | . . . . 5 ⊢ (𝑥 ⊊ Q → 𝑥 ⊆ Q) | |
| 4 | 3 | ad2antlr 740 | . . . 4 ⊢ (((∅ ⊊ 𝑥 ∧ 𝑥 ⊊ Q) ∧ ∀𝑦 ∈ 𝑥 (∀𝑧(𝑧 <Q 𝑦 → 𝑧 ∈ 𝑥) ∧ ∃𝑧 ∈ 𝑥 𝑦 <Q 𝑧)) → 𝑥 ⊆ Q) |
| 5 | 4 | ss2abi 4014 | . . 3 ⊢ {𝑥 ∣ ((∅ ⊊ 𝑥 ∧ 𝑥 ⊊ Q) ∧ ∀𝑦 ∈ 𝑥 (∀𝑧(𝑧 <Q 𝑦 → 𝑧 ∈ 𝑥) ∧ ∃𝑧 ∈ 𝑥 𝑦 <Q 𝑧))} ⊆ {𝑥 ∣ 𝑥 ⊆ Q} |
| 6 | df-np 11047 | . . 3 ⊢ P = {𝑥 ∣ ((∅ ⊊ 𝑥 ∧ 𝑥 ⊊ Q) ∧ ∀𝑦 ∈ 𝑥 (∀𝑧(𝑧 <Q 𝑦 → 𝑧 ∈ 𝑥) ∧ ∃𝑧 ∈ 𝑥 𝑦 <Q 𝑧))} | |
| 7 | df-pw 4559 | . . 3 ⊢ 𝒫 Q = {𝑥 ∣ 𝑥 ⊆ Q} | |
| 8 | 5, 6, 7 | 3sstr4i 3982 | . 2 ⊢ P ⊆ 𝒫 Q |
| 9 | 2, 8 | ssexi 5284 | 1 ⊢ P ∈ V |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∀wal 1568 ∈ wcel 2145 {cab 2739 ∀wral 3077 ∃wrex 3087 Vcvv 3451 ⊆ wss 3899 ⊊ wpss 3900 ∅c0 4279 𝒫 cpw 4557 class class class wbr 5103 Qcnq 10918 <Q cltq 10924 Pcnp 10925 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7740 ax-inf2 9626 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2740 df-cleq 2753 df-clel 2836 df-ne 2957 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-tr 5213 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-ord 6358 df-on 6359 df-lim 6360 df-suc 6361 df-om 7867 df-ni 10938 df-nq 10978 df-np 11047 |
| This theorem is used by: nrex1 11130 enrex 11133 |
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