| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 | ⊢ ∅:∅⟶1-1𝐴 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | f0 6793 | . 2 ⊢ ∅:∅⟶𝐴 | |
| 2 | funcnv0 6636 | . 2 ⊢ Fun ◡∅ | |
| 3 | df-f1 6571 | . 2 ⊢ (∅:∅⟶1-1𝐴 ↔ (∅:∅⟶𝐴 ∧ Fun ◡∅)) | |
| 4 | 1, 2, 3 | mpbir2an 724 | 1 ⊢ ∅:∅⟶1-1𝐴 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∅c0 4281 ◡ccnv 5657 Fun wfun 6560 ⟶wf 6562 ⟶1-1wf1 6563 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 ax-sep 5255 ax-nul 5266 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 2102 df-mo 2567 df-clab 2742 df-cleq 2755 df-clel 2839 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-sn 4589 df-pr 4591 df-op 4841 df-br 5109 df-opab 5174 df-id 5553 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 |
| This theorem is used by: f10d 6890 fo00 6892 0domg 9161 marypha1lem 9462 hashf1 14643 usgr0 29881 f102g 50294 |
| Copyright terms: Public domain | W3C validator |