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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 6548 | . 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 4289 ◡ccnv 5665 Fun wfun 6537 ⟶wf 6539 –1-1→wf1 6540 |
| 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 2148 ax-9 2156 ax-ext 2738 ax-sep 5262 ax-nul 5274 ax-pr 5409 |
| 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 2570 df-clab 2745 df-cleq 2758 df-clel 2841 df-ral 3083 df-rex 3093 df-rab 3420 df-v 3460 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-nul 4290 df-if 4493 df-sn 4595 df-pr 4597 df-op 4601 df-br 5115 df-opab 5179 df-id 5561 df-xp 5672 df-rel 5673 df-cnv 5674 df-co 5675 df-dm 5676 df-rn 5677 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 |
| This theorem is used by: f10d 6862 fo00 6864 0domg 9102 marypha1lem 9403 hashf1 14514 usgr0 29630 f102g 49670 |
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