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Mirrors > Home > ILE Home > Th. List > dm0rn0 | Unicode version |
Description: An empty domain implies an empty range. For a similar theorem for whether the domain and range are inhabited, see dmmrnm 4766. (Contributed by NM, 21-May-1998.) |
Ref | Expression |
---|---|
dm0rn0 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | alnex 1476 |
. . . . . 6
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2 | excom 1643 |
. . . . . 6
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3 | 1, 2 | xchbinx 672 |
. . . . 5
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4 | alnex 1476 |
. . . . 5
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5 | 3, 4 | bitr4i 186 |
. . . 4
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6 | noel 3372 |
. . . . . 6
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7 | 6 | nbn 689 |
. . . . 5
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8 | 7 | albii 1447 |
. . . 4
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9 | noel 3372 |
. . . . . 6
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10 | 9 | nbn 689 |
. . . . 5
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11 | 10 | albii 1447 |
. . . 4
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12 | 5, 8, 11 | 3bitr3i 209 |
. . 3
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13 | abeq1 2250 |
. . 3
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14 | abeq1 2250 |
. . 3
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15 | 12, 13, 14 | 3bitr4i 211 |
. 2
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16 | df-dm 4557 |
. . 3
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17 | 16 | eqeq1i 2148 |
. 2
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18 | dfrn2 4735 |
. . 3
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19 | 18 | eqeq1i 2148 |
. 2
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20 | 15, 17, 19 | 3bitr4i 211 |
1
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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 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-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-pow 4106 ax-pr 4139 |
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-v 2691 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-br 3938 df-opab 3998 df-cnv 4555 df-dm 4557 df-rn 4558 |
This theorem is referenced by: rn0 4803 relrn0 4809 imadisj 4909 ndmima 4924 f00 5322 f0rn0 5325 2nd0 6051 map0b 6589 |
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