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| Mirrors > Home > ILE Home > Th. List > f10d | GIF version | ||
| Description: The empty set maps one-to-one into any class, deduction version. (Contributed by AV, 25-Nov-2020.) |
| Ref | Expression |
|---|---|
| f10d.f | ⊢ (𝜑 → 𝐹 = ∅) |
| Ref | Expression |
|---|---|
| f10d | ⊢ (𝜑 → 𝐹:dom 𝐹–1-1→𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | f10 5674 | . . 3 ⊢ ∅:∅–1-1→𝐴 | |
| 2 | dm0 4995 | . . . 4 ⊢ dom ∅ = ∅ | |
| 3 | f1eq2 5594 | . . . 4 ⊢ (dom ∅ = ∅ → (∅:dom ∅–1-1→𝐴 ↔ ∅:∅–1-1→𝐴)) | |
| 4 | 2, 3 | ax-mp 5 | . . 3 ⊢ (∅:dom ∅–1-1→𝐴 ↔ ∅:∅–1-1→𝐴) |
| 5 | 1, 4 | mpbir 146 | . 2 ⊢ ∅:dom ∅–1-1→𝐴 |
| 6 | f10d.f | . . 3 ⊢ (𝜑 → 𝐹 = ∅) | |
| 7 | 6 | dmeqd 4983 | . . 3 ⊢ (𝜑 → dom 𝐹 = dom ∅) |
| 8 | eqidd 2239 | . . 3 ⊢ (𝜑 → 𝐴 = 𝐴) | |
| 9 | 6, 7, 8 | f1eq123d 5631 | . 2 ⊢ (𝜑 → (𝐹:dom 𝐹–1-1→𝐴 ↔ ∅:dom ∅–1-1→𝐴)) |
| 10 | 5, 9 | mpbiri 168 | 1 ⊢ (𝜑 → 𝐹:dom 𝐹–1-1→𝐴) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 105 = wceq 1402 ∅c0 3520 dom cdm 4774 –1-1→wf1 5374 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4249 ax-nul 4259 ax-pow 4311 ax-pr 4346 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-br 4131 df-opab 4193 df-id 4438 df-xp 4780 df-rel 4781 df-cnv 4782 df-co 4783 df-dm 4784 df-rn 4785 df-fun 5379 df-fn 5380 df-f 5381 df-f1 5382 |
| This theorem is used by: umgr0e 16371 usgr0e 16485 |
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