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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 3525 |
. . . . . 6
| |
| 2 | 1st0 6368 |
. . . . . . 7
| |
| 3 | 2 | eleq2i 2305 |
. . . . . 6
|
| 4 | 1, 3 | mtbir 682 |
. . . . 5
|
| 5 | 4 | nex 1553 |
. . . 4
|
| 6 | rexex 2596 |
. . . 4
| |
| 7 | 5, 6 | mto 672 |
. . 3
|
| 8 | prml 7834 |
. . 3
| |
| 9 | 7, 8 | mto 672 |
. 2
|
| 10 | prop 7832 |
. 2
| |
| 11 | 9, 10 | mto 672 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-coll 4241 ax-sep 4244 ax-nul 4254 ax-pow 4306 ax-pr 4341 ax-un 4573 ax-iinf 4730 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-ral 2533 df-rex 2534 df-reu 2535 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-pw 3687 df-sn 3711 df-pr 3712 df-op 3714 df-uni 3931 df-int 3966 df-iun 4009 df-br 4126 df-opab 4188 df-mpt 4189 df-id 4433 df-iom 4733 df-xp 4775 df-rel 4776 df-cnv 4777 df-co 4778 df-dm 4779 df-rn 4780 df-res 4781 df-ima 4782 df-iota 5332 df-fun 5374 df-fn 5375 df-f 5376 df-f1 5377 df-fo 5378 df-f1o 5379 df-fv 5380 df-1st 6364 df-2nd 6365 df-qs 6803 df-ni 7661 df-nqqs 7705 df-inp 7823 |
| This theorem is referenced by: (None) |
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