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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 5578 | . 2 ⊢ ∅:∅⟶𝐴 | |
| 2 | fun0 5434 | . . 3 ⊢ Fun ∅ | |
| 3 | cnv0 5186 | . . . 4 ⊢ ◡∅ = ∅ | |
| 4 | 3 | funeqi 5393 | . . 3 ⊢ (Fun ◡∅ ↔ Fun ∅) |
| 5 | 2, 4 | mpbir 146 | . 2 ⊢ Fun ◡∅ |
| 6 | df-f1 5377 | . 2 ⊢ (∅:∅–1-1→𝐴 ↔ (∅:∅⟶𝐴 ∧ Fun ◡∅)) | |
| 7 | 1, 5, 6 | mpbir2an 955 | 1 ⊢ ∅:∅–1-1→𝐴 |
| Colors of variables: wff set class |
| Syntax hints: ∅c0 3520 ◡ccnv 4768 Fun wfun 5366 ⟶wf 5368 –1-1→wf1 5369 |
| 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-sep 4244 ax-nul 4254 ax-pow 4306 ax-pr 4341 |
| 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-ral 2533 df-rex 2534 df-v 2823 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-br 4126 df-opab 4188 df-id 4433 df-xp 4775 df-rel 4776 df-cnv 4777 df-co 4778 df-dm 4779 df-rn 4780 df-fun 5374 df-fn 5375 df-f 5376 df-f1 5377 |
| This theorem is referenced by: f10d 5670 fo00 5672 hashf1 11265 usgr0 16394 |
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