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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 10896 | . . 3 ⊢ Q ∈ V | |
| 2 | 1 | pwex 5342 | . 2 ⊢ 𝒫 Q ∈ V |
| 3 | pssss 4054 | . . . . 5 ⊢ (𝑥 ⊊ Q → 𝑥 ⊆ Q) | |
| 4 | 3 | ad2antlr 739 | . . . 4 ⊢ (((∅ ⊊ 𝑥 ∧ 𝑥 ⊊ Q) ∧ ∀𝑦 ∈ 𝑥 (∀𝑧(𝑧 <Q 𝑦 → 𝑧 ∈ 𝑥) ∧ ∃𝑧 ∈ 𝑥 𝑦 <Q 𝑧)) → 𝑥 ⊆ Q) |
| 5 | 4 | ss2abi 4022 | . . 3 ⊢ {𝑥 ∣ ((∅ ⊊ 𝑥 ∧ 𝑥 ⊊ Q) ∧ ∀𝑦 ∈ 𝑥 (∀𝑧(𝑧 <Q 𝑦 → 𝑧 ∈ 𝑥) ∧ ∃𝑧 ∈ 𝑥 𝑦 <Q 𝑧))} ⊆ {𝑥 ∣ 𝑥 ⊆ Q} |
| 6 | df-np 10954 | . . 3 ⊢ P = {𝑥 ∣ ((∅ ⊊ 𝑥 ∧ 𝑥 ⊊ Q) ∧ ∀𝑦 ∈ 𝑥 (∀𝑧(𝑧 <Q 𝑦 → 𝑧 ∈ 𝑥) ∧ ∃𝑧 ∈ 𝑥 𝑦 <Q 𝑧))} | |
| 7 | df-pw 4560 | . . 3 ⊢ 𝒫 Q = {𝑥 ∣ 𝑥 ⊆ Q} | |
| 8 | 5, 6, 7 | 3sstr4i 3990 | . 2 ⊢ P ⊆ 𝒫 Q |
| 9 | 2, 8 | ssexi 5283 | 1 ⊢ P ∈ V |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 ∀wal 1561 ∈ wcel 2145 {cab 2743 ∀wral 3079 ∃wrex 3089 Vcvv 3457 ⊆ wss 3907 ⊊ wpss 3908 ∅c0 4288 𝒫 cpw 4558 class class class wbr 5105 Qcnq 10825 <Q cltq 10831 Pcnp 10832 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-ext 2737 ax-sep 5251 ax-nul 5261 ax-pow 5327 ax-pr 5395 ax-un 7722 ax-inf2 9598 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-sb 2094 df-clab 2744 df-cleq 2757 df-clel 2840 df-ne 2961 df-ral 3080 df-rex 3090 df-rab 3418 df-v 3459 df-dif 3910 df-un 3912 df-in 3914 df-ss 3924 df-pss 3927 df-nul 4289 df-if 4484 df-pw 4560 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4869 df-br 5106 df-opab 5168 df-tr 5213 df-eprel 5552 df-po 5560 df-so 5561 df-fr 5605 df-we 5607 df-xp 5658 df-rel 5659 df-ord 6353 df-on 6354 df-lim 6355 df-suc 6356 df-om 7851 df-ni 10845 df-nq 10885 df-np 10954 |
| This theorem is referenced by: nrex1 11037 enrex 11040 |
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