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Mirrors > Home > MPE Home > Th. List > nsmallnq | Structured version Visualization version GIF version |
Description: The is no smallest positive fraction. (Contributed by NM, 26-Apr-1996.) (Revised by Mario Carneiro, 10-May-2013.) (New usage is discouraged.) |
Ref | Expression |
---|---|
nsmallnq | ⊢ (𝐴 ∈ Q → ∃𝑥 𝑥 <Q 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | halfnq 9798 | . 2 ⊢ (𝐴 ∈ Q → ∃𝑥(𝑥 +Q 𝑥) = 𝐴) | |
2 | eleq1a 2696 | . . . . 5 ⊢ (𝐴 ∈ Q → ((𝑥 +Q 𝑥) = 𝐴 → (𝑥 +Q 𝑥) ∈ Q)) | |
3 | addnqf 9770 | . . . . . . . 8 ⊢ +Q :(Q × Q)⟶Q | |
4 | 3 | fdmi 6052 | . . . . . . 7 ⊢ dom +Q = (Q × Q) |
5 | 0nnq 9746 | . . . . . . 7 ⊢ ¬ ∅ ∈ Q | |
6 | 4, 5 | ndmovrcl 6820 | . . . . . 6 ⊢ ((𝑥 +Q 𝑥) ∈ Q → (𝑥 ∈ Q ∧ 𝑥 ∈ Q)) |
7 | ltaddnq 9796 | . . . . . 6 ⊢ ((𝑥 ∈ Q ∧ 𝑥 ∈ Q) → 𝑥 <Q (𝑥 +Q 𝑥)) | |
8 | 6, 7 | syl 17 | . . . . 5 ⊢ ((𝑥 +Q 𝑥) ∈ Q → 𝑥 <Q (𝑥 +Q 𝑥)) |
9 | 2, 8 | syl6 35 | . . . 4 ⊢ (𝐴 ∈ Q → ((𝑥 +Q 𝑥) = 𝐴 → 𝑥 <Q (𝑥 +Q 𝑥))) |
10 | breq2 4657 | . . . 4 ⊢ ((𝑥 +Q 𝑥) = 𝐴 → (𝑥 <Q (𝑥 +Q 𝑥) ↔ 𝑥 <Q 𝐴)) | |
11 | 9, 10 | mpbidi 231 | . . 3 ⊢ (𝐴 ∈ Q → ((𝑥 +Q 𝑥) = 𝐴 → 𝑥 <Q 𝐴)) |
12 | 11 | eximdv 1846 | . 2 ⊢ (𝐴 ∈ Q → (∃𝑥(𝑥 +Q 𝑥) = 𝐴 → ∃𝑥 𝑥 <Q 𝐴)) |
13 | 1, 12 | mpd 15 | 1 ⊢ (𝐴 ∈ Q → ∃𝑥 𝑥 <Q 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 384 = wceq 1483 ∃wex 1704 ∈ wcel 1990 class class class wbr 4653 × cxp 5112 (class class class)co 6650 Qcnq 9674 +Q cplq 9677 <Q cltq 9680 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3or 1038 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-reu 2919 df-rmo 2920 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-pss 3590 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-tp 4182 df-op 4184 df-uni 4437 df-iun 4522 df-br 4654 df-opab 4713 df-mpt 4730 df-tr 4753 df-id 5024 df-eprel 5029 df-po 5035 df-so 5036 df-fr 5073 df-we 5075 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-pred 5680 df-ord 5726 df-on 5727 df-lim 5728 df-suc 5729 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-om 7066 df-1st 7168 df-2nd 7169 df-wrecs 7407 df-recs 7468 df-rdg 7506 df-1o 7560 df-oadd 7564 df-omul 7565 df-er 7742 df-ni 9694 df-pli 9695 df-mi 9696 df-lti 9697 df-plpq 9730 df-mpq 9731 df-ltpq 9732 df-enq 9733 df-nq 9734 df-erq 9735 df-plq 9736 df-mq 9737 df-1nq 9738 df-rq 9739 df-ltnq 9740 |
This theorem is referenced by: ltbtwnnq 9800 nqpr 9836 reclem2pr 9870 |
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