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Mirrors > Home > ILE Home > Th. List > f10 | Unicode version |
Description: The empty set maps one-to-one into any class. (Contributed by NM, 7-Apr-1998.) |
Ref | Expression |
---|---|
f10 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | f0 5214 |
. 2
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2 | fun0 5085 |
. . 3
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3 | cnv0 4848 |
. . . 4
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4 | 3 | funeqi 5049 |
. . 3
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5 | 2, 4 | mpbir 145 |
. 2
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6 | df-f1 5033 |
. 2
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7 | 1, 5, 6 | mpbir2an 889 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 580 ax-in2 581 ax-io 666 ax-5 1382 ax-7 1383 ax-gen 1384 ax-ie1 1428 ax-ie2 1429 ax-8 1441 ax-10 1442 ax-11 1443 ax-i12 1444 ax-bndl 1445 ax-4 1446 ax-14 1451 ax-17 1465 ax-i9 1469 ax-ial 1473 ax-i5r 1474 ax-ext 2071 ax-sep 3963 ax-nul 3971 ax-pow 4015 ax-pr 4045 |
This theorem depends on definitions: df-bi 116 df-3an 927 df-tru 1293 df-fal 1296 df-nf 1396 df-sb 1694 df-eu 1952 df-mo 1953 df-clab 2076 df-cleq 2082 df-clel 2085 df-nfc 2218 df-ral 2365 df-rex 2366 df-v 2622 df-dif 3002 df-un 3004 df-in 3006 df-ss 3013 df-nul 3288 df-pw 3435 df-sn 3456 df-pr 3457 df-op 3459 df-br 3852 df-opab 3906 df-id 4129 df-xp 4457 df-rel 4458 df-cnv 4459 df-co 4460 df-dm 4461 df-rn 4462 df-fun 5030 df-fn 5031 df-f 5032 df-f1 5033 |
This theorem is referenced by: fo00 5302 |
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