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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 11035 | . . 3 ⊢ Q ∈ V | |
| 2 | 1 | pwex 5346 | . 2 ⊢ 𝒫 Q ∈ V |
| 3 | pssss 4028 | . . . . 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 3994 | . . 3 ⊢ {𝑥 ∣ ((∅ ⊊ 𝑥 ∧ 𝑥 ⊊ Q) ∧ ∀𝑦 ∈ 𝑥 (∀𝑧(𝑧 <Q 𝑦 → 𝑧 ∈ 𝑥) ∧ ∃𝑧 ∈ 𝑥 𝑦 <Q 𝑧))} ⊆ {𝑥 ∣ 𝑥 ⊆ Q} |
| 6 | df-np 11093 | . . 3 ⊢ P = {𝑥 ∣ ((∅ ⊊ 𝑥 ∧ 𝑥 ⊊ Q) ∧ ∀𝑦 ∈ 𝑥 (∀𝑧(𝑧 <Q 𝑦 → 𝑧 ∈ 𝑥) ∧ ∃𝑧 ∈ 𝑥 𝑦 <Q 𝑧))} | |
| 7 | df-pw 4562 | . . 3 ⊢ 𝒫 Q = {𝑥 ∣ 𝑥 ⊆ Q} | |
| 8 | 5, 6, 7 | 3sstr4i 3964 | . 2 ⊢ P ⊆ 𝒫 Q |
| 9 | 2, 8 | ssexi 5288 | 1 ⊢ P ∈ V |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∀wal 1568 ∈ wcel 2147 {cab 2741 ∀wral 3080 ∃wrex 3090 Vcvv 3454 ⊆ wss 3900 ⊊ wpss 4016 ∅c0 4281 𝒫 cpw 4560 class class class wbr 5106 Qcnq 10964 <Q cltq 10970 Pcnp 10971 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 ax-sep 5252 ax-nul 5263 ax-pow 5331 ax-pr 5395 ax-un 7775 ax-inf2 9669 |
| 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 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-ne 2960 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-br 5107 df-opab 5171 df-tr 5216 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-ord 6383 df-on 6384 df-lim 6385 df-suc 6386 df-om 7902 df-ni 10984 df-nq 11024 df-np 11093 |
| This theorem is used by: nrex1 11176 enrex 11179 |
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