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| Mirrors > Home > ILE Home > Th. List > f10 | 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 5527 | . 2 ⊢ ∅:∅⟶𝐴 | |
| 2 | fun0 5388 | . . 3 ⊢ Fun ∅ | |
| 3 | cnv0 5140 | . . . 4 ⊢ ◡∅ = ∅ | |
| 4 | 3 | funeqi 5347 | . . 3 ⊢ (Fun ◡∅ ↔ Fun ∅) |
| 5 | 2, 4 | mpbir 146 | . 2 ⊢ Fun ◡∅ |
| 6 | df-f1 5331 | . 2 ⊢ (∅:∅–1-1→𝐴 ↔ (∅:∅⟶𝐴 ∧ Fun ◡∅)) | |
| 7 | 1, 5, 6 | mpbir2an 950 | 1 ⊢ ∅:∅–1-1→𝐴 |
| Colors of variables: wff set class |
| Syntax hints: ∅c0 3494 ◡ccnv 4724 Fun wfun 5320 ⟶wf 5322 –1-1→wf1 5323 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-nul 4215 ax-pow 4264 ax-pr 4299 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ral 2515 df-rex 2516 df-v 2804 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-nul 3495 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-br 4089 df-opab 4151 df-id 4390 df-xp 4731 df-rel 4732 df-cnv 4733 df-co 4734 df-dm 4735 df-rn 4736 df-fun 5328 df-fn 5329 df-f 5330 df-f1 5331 |
| This theorem is referenced by: f10d 5619 fo00 5621 usgr0 16089 |
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