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| Mirrors > Home > MPE Home > Th. List > prnmadd | Structured version Visualization version GIF version | ||
| Description: A positive real has no largest member. Addition version. (Contributed by NM, 7-Apr-1996.) (Revised by Mario Carneiro, 11-May-2013.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| prnmadd | ⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ 𝐴) → ∃𝑥(𝐵 +Q 𝑥) ∈ 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | prnmax 11035 | . 2 ⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ 𝐴) → ∃𝑦 ∈ 𝐴 𝐵 <Q 𝑦) | |
| 2 | ltrelnq 10966 | . . . . . . 7 ⊢ <Q ⊆ (Q × Q) | |
| 3 | 2 | brel 5750 | . . . . . 6 ⊢ (𝐵 <Q 𝑦 → (𝐵 ∈ Q ∧ 𝑦 ∈ Q)) |
| 4 | 3 | simprd 495 | . . . . 5 ⊢ (𝐵 <Q 𝑦 → 𝑦 ∈ Q) |
| 5 | ltexnq 11015 | . . . . . 6 ⊢ (𝑦 ∈ Q → (𝐵 <Q 𝑦 ↔ ∃𝑥(𝐵 +Q 𝑥) = 𝑦)) | |
| 6 | 5 | biimpcd 249 | . . . . 5 ⊢ (𝐵 <Q 𝑦 → (𝑦 ∈ Q → ∃𝑥(𝐵 +Q 𝑥) = 𝑦)) |
| 7 | 4, 6 | mpd 15 | . . . 4 ⊢ (𝐵 <Q 𝑦 → ∃𝑥(𝐵 +Q 𝑥) = 𝑦) |
| 8 | eleq1a 2836 | . . . . 5 ⊢ (𝑦 ∈ 𝐴 → ((𝐵 +Q 𝑥) = 𝑦 → (𝐵 +Q 𝑥) ∈ 𝐴)) | |
| 9 | 8 | eximdv 1917 | . . . 4 ⊢ (𝑦 ∈ 𝐴 → (∃𝑥(𝐵 +Q 𝑥) = 𝑦 → ∃𝑥(𝐵 +Q 𝑥) ∈ 𝐴)) |
| 10 | 7, 9 | syl5 34 | . . 3 ⊢ (𝑦 ∈ 𝐴 → (𝐵 <Q 𝑦 → ∃𝑥(𝐵 +Q 𝑥) ∈ 𝐴)) |
| 11 | 10 | rexlimiv 3148 | . 2 ⊢ (∃𝑦 ∈ 𝐴 𝐵 <Q 𝑦 → ∃𝑥(𝐵 +Q 𝑥) ∈ 𝐴) |
| 12 | 1, 11 | syl 17 | 1 ⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ 𝐴) → ∃𝑥(𝐵 +Q 𝑥) ∈ 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1540 ∃wex 1779 ∈ wcel 2108 ∃wrex 3070 class class class wbr 5143 (class class class)co 7431 Qcnq 10892 +Q cplq 10895 <Q cltq 10898 Pcnp 10899 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-sep 5296 ax-nul 5306 ax-pr 5432 ax-un 7755 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-ral 3062 df-rex 3071 df-rmo 3380 df-reu 3381 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-pss 3971 df-nul 4334 df-if 4526 df-pw 4602 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4908 df-int 4947 df-iun 4993 df-br 5144 df-opab 5206 df-mpt 5226 df-tr 5260 df-id 5578 df-eprel 5584 df-po 5592 df-so 5593 df-fr 5637 df-we 5639 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-rn 5696 df-res 5697 df-ima 5698 df-pred 6321 df-ord 6387 df-on 6388 df-lim 6389 df-suc 6390 df-iota 6514 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-ov 7434 df-oprab 7435 df-mpo 7436 df-om 7888 df-1st 8014 df-2nd 8015 df-frecs 8306 df-wrecs 8337 df-recs 8411 df-rdg 8450 df-1o 8506 df-oadd 8510 df-omul 8511 df-er 8745 df-ni 10912 df-pli 10913 df-mi 10914 df-lti 10915 df-plpq 10948 df-mpq 10949 df-ltpq 10950 df-enq 10951 df-nq 10952 df-erq 10953 df-plq 10954 df-mq 10955 df-1nq 10956 df-ltnq 10958 df-np 11021 |
| This theorem is referenced by: ltexprlem1 11076 ltexprlem7 11082 |
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