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Mirrors > Home > ILE Home > Th. List > 0npr | Unicode version |
Description: The empty set is not a positive real. (Contributed by NM, 15-Nov-1995.) |
Ref | Expression |
---|---|
0npr |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | noel 3372 | . . . . . 6 | |
2 | 1st0 6050 | . . . . . . 7 | |
3 | 2 | eleq2i 2207 | . . . . . 6 |
4 | 1, 3 | mtbir 661 | . . . . 5 |
5 | 4 | nex 1477 | . . . 4 |
6 | rexex 2482 | . . . 4 | |
7 | 5, 6 | mto 652 | . . 3 |
8 | prml 7309 | . . 3 | |
9 | 7, 8 | mto 652 | . 2 |
10 | prop 7307 | . 2 | |
11 | 9, 10 | mto 652 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wex 1469 wcel 1481 wrex 2418 c0 3368 cop 3535 cfv 5131 c1st 6044 c2nd 6045 cnq 7112 cnp 7123 |
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-iinf 4510 |
This theorem depends on definitions: df-bi 116 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-id 4223 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-1st 6046 df-2nd 6047 df-qs 6443 df-ni 7136 df-nqqs 7180 df-inp 7298 |
This theorem is referenced by: (None) |
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