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| Mirrors > Home > ILE Home > Th. List > f10 | GIF version | ||
| Description: The empty set maps one-to-one into any class. (Contributed by NM, 7-Apr-1998.) |
| Ref | Expression |
|---|---|
| f10 | ⊢ ∅:∅–1-1→𝐴 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | f0 5536 | . 2 ⊢ ∅:∅⟶𝐴 | |
| 2 | fun0 5395 | . . 3 ⊢ Fun ∅ | |
| 3 | cnv0 5147 | . . . 4 ⊢ ◡∅ = ∅ | |
| 4 | 3 | funeqi 5354 | . . 3 ⊢ (Fun ◡∅ ↔ Fun ∅) |
| 5 | 2, 4 | mpbir 146 | . 2 ⊢ Fun ◡∅ |
| 6 | df-f1 5338 | . 2 ⊢ (∅:∅–1-1→𝐴 ↔ (∅:∅⟶𝐴 ∧ Fun ◡∅)) | |
| 7 | 1, 5, 6 | mpbir2an 951 | 1 ⊢ ∅:∅–1-1→𝐴 |
| Colors of variables: wff set class |
| Syntax hints: ∅c0 3496 ◡ccnv 4730 Fun wfun 5327 ⟶wf 5329 –1-1→wf1 5330 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-14 2205 ax-ext 2213 ax-sep 4212 ax-nul 4220 ax-pow 4270 ax-pr 4305 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ral 2516 df-rex 2517 df-v 2805 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-nul 3497 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-br 4094 df-opab 4156 df-id 4396 df-xp 4737 df-rel 4738 df-cnv 4739 df-co 4740 df-dm 4741 df-rn 4742 df-fun 5335 df-fn 5336 df-f 5337 df-f1 5338 |
| This theorem is referenced by: f10d 5628 fo00 5630 usgr0 16180 |
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