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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 5524 | . 2 ⊢ ∅:∅⟶𝐴 | |
| 2 | fun0 5385 | . . 3 ⊢ Fun ∅ | |
| 3 | cnv0 5138 | . . . 4 ⊢ ◡∅ = ∅ | |
| 4 | 3 | funeqi 5345 | . . 3 ⊢ (Fun ◡∅ ↔ Fun ∅) |
| 5 | 2, 4 | mpbir 146 | . 2 ⊢ Fun ◡∅ |
| 6 | df-f1 5329 | . 2 ⊢ (∅:∅–1-1→𝐴 ↔ (∅:∅⟶𝐴 ∧ Fun ◡∅)) | |
| 7 | 1, 5, 6 | mpbir2an 948 | 1 ⊢ ∅:∅–1-1→𝐴 |
| Colors of variables: wff set class |
| Syntax hints: ∅c0 3492 ◡ccnv 4722 Fun wfun 5318 ⟶wf 5320 –1-1→wf1 5321 |
| 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-14 2203 ax-ext 2211 ax-sep 4205 ax-nul 4213 ax-pow 4262 ax-pr 4297 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-rex 2514 df-v 2802 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-nul 3493 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-br 4087 df-opab 4149 df-id 4388 df-xp 4729 df-rel 4730 df-cnv 4731 df-co 4732 df-dm 4733 df-rn 4734 df-fun 5326 df-fn 5327 df-f 5328 df-f1 5329 |
| This theorem is referenced by: f10d 5615 fo00 5617 usgr0 16078 |
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