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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 2345 | . . 3 ⊢ ¬ ∅ ≠ ∅ | |
2 | enqer 7299 | . . . . 5 ⊢ ~Q Er (N × N) | |
3 | erdm 6511 | . . . . 5 ⊢ ( ~Q Er (N × N) → dom ~Q = (N × N)) | |
4 | 2, 3 | ax-mp 5 | . . . 4 ⊢ dom ~Q = (N × N) |
5 | elqsn0 6570 | . . . 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 7289 | . . 3 ⊢ Q = ((N × N) / ~Q ) | |
9 | 8 | eleq2i 2233 | . 2 ⊢ (∅ ∈ Q ↔ ∅ ∈ ((N × N) / ~Q )) |
10 | 7, 9 | mtbir 661 | 1 ⊢ ¬ ∅ ∈ Q |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 = wceq 1343 ∈ wcel 2136 ≠ wne 2336 ∅c0 3409 × cxp 4602 dom cdm 4604 Er wer 6498 / cqs 6500 Ncnpi 7213 ~Q ceq 7220 Qcnq 7221 |
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 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-coll 4097 ax-sep 4100 ax-nul 4108 ax-pow 4153 ax-pr 4187 ax-un 4411 ax-setind 4514 ax-iinf 4565 |
This theorem depends on definitions: df-bi 116 df-dc 825 df-3or 969 df-3an 970 df-tru 1346 df-fal 1349 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ne 2337 df-ral 2449 df-rex 2450 df-reu 2451 df-rab 2453 df-v 2728 df-sbc 2952 df-csb 3046 df-dif 3118 df-un 3120 df-in 3122 df-ss 3129 df-nul 3410 df-pw 3561 df-sn 3582 df-pr 3583 df-op 3585 df-uni 3790 df-int 3825 df-iun 3868 df-br 3983 df-opab 4044 df-mpt 4045 df-tr 4081 df-id 4271 df-iord 4344 df-on 4346 df-suc 4349 df-iom 4568 df-xp 4610 df-rel 4611 df-cnv 4612 df-co 4613 df-dm 4614 df-rn 4615 df-res 4616 df-ima 4617 df-iota 5153 df-fun 5190 df-fn 5191 df-f 5192 df-f1 5193 df-fo 5194 df-f1o 5195 df-fv 5196 df-ov 5845 df-oprab 5846 df-mpo 5847 df-1st 6108 df-2nd 6109 df-recs 6273 df-irdg 6338 df-oadd 6388 df-omul 6389 df-er 6501 df-ec 6503 df-qs 6507 df-ni 7245 df-mi 7247 df-enq 7288 df-nqqs 7289 |
This theorem is referenced by: (None) |
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