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| Mirrors > Home > MPE Home > Th. List > f10 | Structured version Visualization version 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 6756 | . 2 ⊢ ∅:∅⟶𝐴 | |
| 2 | funcnv0 6599 | . 2 ⊢ Fun ◡∅ | |
| 3 | df-f1 6538 | . 2 ⊢ (∅:∅–1-1→𝐴 ↔ (∅:∅⟶𝐴 ∧ Fun ◡∅)) | |
| 4 | 1, 2, 3 | mpbir2an 724 | 1 ⊢ ∅:∅–1-1→𝐴 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∅c0 4279 ◡ccnv 5654 Fun wfun 6527 ⟶wf 6529 –1-1→wf1 6530 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2732 ax-sep 5251 ax-nul 5263 ax-pr 5398 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-mo 2564 df-clab 2739 df-cleq 2752 df-clel 2835 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-br 5104 df-opab 5168 df-id 5550 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 |
| This theorem is used by: f10d 6852 fo00 6854 0domg 9102 marypha1lem 9403 hashf1 14522 usgr0 29703 f102g 49780 |
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