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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 10878 | . . 3 ⊢ Q ∈ V | |
| 2 | 1 | pwex 5336 | . 2 ⊢ 𝒫 Q ∈ V |
| 3 | pssss 4051 | . . . . 5 ⊢ (𝑥 ⊊ Q → 𝑥 ⊆ Q) | |
| 4 | 3 | ad2antlr 737 | . . . 4 ⊢ (((∅ ⊊ 𝑥 ∧ 𝑥 ⊊ Q) ∧ ∀𝑦 ∈ 𝑥 (∀𝑧(𝑧 <Q 𝑦 → 𝑧 ∈ 𝑥) ∧ ∃𝑧 ∈ 𝑥 𝑦 <Q 𝑧)) → 𝑥 ⊆ Q) |
| 5 | 4 | ss2abi 4019 | . . 3 ⊢ {𝑥 ∣ ((∅ ⊊ 𝑥 ∧ 𝑥 ⊊ Q) ∧ ∀𝑦 ∈ 𝑥 (∀𝑧(𝑧 <Q 𝑦 → 𝑧 ∈ 𝑥) ∧ ∃𝑧 ∈ 𝑥 𝑦 <Q 𝑧))} ⊆ {𝑥 ∣ 𝑥 ⊆ Q} |
| 6 | df-np 10936 | . . 3 ⊢ P = {𝑥 ∣ ((∅ ⊊ 𝑥 ∧ 𝑥 ⊊ Q) ∧ ∀𝑦 ∈ 𝑥 (∀𝑧(𝑧 <Q 𝑦 → 𝑧 ∈ 𝑥) ∧ ∃𝑧 ∈ 𝑥 𝑦 <Q 𝑧))} | |
| 7 | df-pw 4556 | . . 3 ⊢ 𝒫 Q = {𝑥 ∣ 𝑥 ⊆ Q} | |
| 8 | 5, 6, 7 | 3sstr4i 3987 | . 2 ⊢ P ⊆ 𝒫 Q |
| 9 | 2, 8 | ssexi 5277 | 1 ⊢ P ∈ V |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 399 ∀wal 1557 ∈ wcel 2141 {cab 2739 ∀wral 3075 ∃wrex 3085 Vcvv 3453 ⊆ wss 3904 ⊊ wpss 3905 ∅c0 4285 𝒫 cpw 4554 class class class wbr 5099 Qcnq 10807 <Q cltq 10813 Pcnp 10814 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-ext 2733 ax-sep 5245 ax-nul 5255 ax-pow 5321 ax-pr 5389 ax-un 7714 ax-inf2 9593 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1098 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-sb 2090 df-clab 2740 df-cleq 2753 df-clel 2836 df-ne 2957 df-ral 3076 df-rex 3086 df-rab 3414 df-v 3455 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4582 df-pr 4584 df-op 4588 df-uni 4865 df-br 5100 df-opab 5162 df-tr 5207 df-eprel 5545 df-po 5553 df-so 5554 df-fr 5598 df-we 5600 df-xp 5651 df-rel 5652 df-ord 6345 df-on 6346 df-lim 6347 df-suc 6348 df-om 7843 df-ni 10827 df-nq 10867 df-np 10936 |
| This theorem is referenced by: nrex1 11019 enrex 11022 |
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