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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 5478 | . 2 ⊢ ∅:∅⟶𝐴 | |
| 2 | fun0 5341 | . . 3 ⊢ Fun ∅ | |
| 3 | cnv0 5095 | . . . 4 ⊢ ◡∅ = ∅ | |
| 4 | 3 | funeqi 5301 | . . 3 ⊢ (Fun ◡∅ ↔ Fun ∅) |
| 5 | 2, 4 | mpbir 146 | . 2 ⊢ Fun ◡∅ |
| 6 | df-f1 5285 | . 2 ⊢ (∅:∅–1-1→𝐴 ↔ (∅:∅⟶𝐴 ∧ Fun ◡∅)) | |
| 7 | 1, 5, 6 | mpbir2an 945 | 1 ⊢ ∅:∅–1-1→𝐴 |
| Colors of variables: wff set class |
| Syntax hints: ∅c0 3464 ◡ccnv 4682 Fun wfun 5274 ⟶wf 5276 –1-1→wf1 5277 |
| 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 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-14 2180 ax-ext 2188 ax-sep 4170 ax-nul 4178 ax-pow 4226 ax-pr 4261 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ral 2490 df-rex 2491 df-v 2775 df-dif 3172 df-un 3174 df-in 3176 df-ss 3183 df-nul 3465 df-pw 3623 df-sn 3644 df-pr 3645 df-op 3647 df-br 4052 df-opab 4114 df-id 4348 df-xp 4689 df-rel 4690 df-cnv 4691 df-co 4692 df-dm 4693 df-rn 4694 df-fun 5282 df-fn 5283 df-f 5284 df-f1 5285 |
| This theorem is referenced by: f10d 5569 fo00 5571 |
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