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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 6761 | . 2 ⊢ ∅:∅⟶𝐴 | |
| 2 | funcnv0 6604 | . 2 ⊢ Fun ◡∅ | |
| 3 | df-f1 6542 | . 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 5650 Fun wfun 6531 ⟶wf 6533 –1-1→wf1 6534 |
| 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 2733 ax-sep 5249 ax-nul 5260 ax-pr 5391 |
| 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 2565 df-clab 2740 df-cleq 2753 df-clel 2836 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 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 5546 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 |
| This theorem is used by: f10d 6857 fo00 6859 0domg 9116 marypha1lem 9418 hashf1 14595 usgr0 29817 f102g 49931 |
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