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Mirrors > Home > ILE Home > Th. List > 0nnq | GIF version |
Description: The empty set is not a positive fraction. (Contributed by NM, 24-Aug-1995.) (Revised by Mario Carneiro, 27-Apr-2013.) |
Ref | Expression |
---|---|
0nnq | ⊢ ¬ ∅ ∈ Q |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | neirr 2318 | . . 3 ⊢ ¬ ∅ ≠ ∅ | |
2 | enqer 7190 | . . . . 5 ⊢ ~Q Er (N × N) | |
3 | erdm 6447 | . . . . 5 ⊢ ( ~Q Er (N × N) → dom ~Q = (N × N)) | |
4 | 2, 3 | ax-mp 5 | . . . 4 ⊢ dom ~Q = (N × N) |
5 | elqsn0 6506 | . . . 4 ⊢ ((dom ~Q = (N × N) ∧ ∅ ∈ ((N × N) / ~Q )) → ∅ ≠ ∅) | |
6 | 4, 5 | mpan 421 | . . 3 ⊢ (∅ ∈ ((N × N) / ~Q ) → ∅ ≠ ∅) |
7 | 1, 6 | mto 652 | . 2 ⊢ ¬ ∅ ∈ ((N × N) / ~Q ) |
8 | df-nqqs 7180 | . . 3 ⊢ Q = ((N × N) / ~Q ) | |
9 | 8 | eleq2i 2207 | . 2 ⊢ (∅ ∈ Q ↔ ∅ ∈ ((N × N) / ~Q )) |
10 | 7, 9 | mtbir 661 | 1 ⊢ ¬ ∅ ∈ Q |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 = wceq 1332 ∈ wcel 1481 ≠ wne 2309 ∅c0 3368 × cxp 4545 dom cdm 4547 Er wer 6434 / cqs 6436 Ncnpi 7104 ~Q ceq 7111 Qcnq 7112 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-13 1492 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-coll 4051 ax-sep 4054 ax-nul 4062 ax-pow 4106 ax-pr 4139 ax-un 4363 ax-setind 4460 ax-iinf 4510 |
This theorem depends on definitions: df-bi 116 df-dc 821 df-3or 964 df-3an 965 df-tru 1335 df-fal 1338 df-nf 1438 df-sb 1737 df-eu 2003 df-mo 2004 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ne 2310 df-ral 2422 df-rex 2423 df-reu 2424 df-rab 2426 df-v 2691 df-sbc 2914 df-csb 3008 df-dif 3078 df-un 3080 df-in 3082 df-ss 3089 df-nul 3369 df-pw 3517 df-sn 3538 df-pr 3539 df-op 3541 df-uni 3745 df-int 3780 df-iun 3823 df-br 3938 df-opab 3998 df-mpt 3999 df-tr 4035 df-id 4223 df-iord 4296 df-on 4298 df-suc 4301 df-iom 4513 df-xp 4553 df-rel 4554 df-cnv 4555 df-co 4556 df-dm 4557 df-rn 4558 df-res 4559 df-ima 4560 df-iota 5096 df-fun 5133 df-fn 5134 df-f 5135 df-f1 5136 df-fo 5137 df-f1o 5138 df-fv 5139 df-ov 5785 df-oprab 5786 df-mpo 5787 df-1st 6046 df-2nd 6047 df-recs 6210 df-irdg 6275 df-oadd 6325 df-omul 6326 df-er 6437 df-ec 6439 df-qs 6443 df-ni 7136 df-mi 7138 df-enq 7179 df-nqqs 7180 |
This theorem is referenced by: (None) |
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