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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 6766 | . 2 ⊢ ∅:∅⟶𝐴 | |
| 2 | funcnv0 6609 | . 2 ⊢ Fun ◡∅ | |
| 3 | df-f1 6546 | . 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 4277 ◡ccnv 5649 Fun wfun 6535 ⟶wf 6537 –1-1→wf1 6538 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pr 5390 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2099 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-ss 3897 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-sn 4585 df-pr 4587 df-op 4835 df-br 5103 df-opab 5167 df-id 5545 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 |
| This theorem is used by: f10d 6862 fo00 6864 0domg 9128 marypha1lem 9430 hashf1 14607 usgr0 29831 f102g 50070 |
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