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| Mirrors > Home > MPE Home > Th. List > Mathboxes > f1sn2g | Structured version Visualization version GIF version | ||
| Description: A function that maps a singleton to a class is injective. (Contributed by Zhi Wang, 1-Oct-2024.) |
| Ref | Expression |
|---|---|
| f1sn2g | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐹:{𝐴}⟶𝐵) → 𝐹:{𝐴}–1-1→𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fsn2g 7135 | . . . . 5 ⊢ (𝐴 ∈ 𝑉 → (𝐹:{𝐴}⟶𝐵 ↔ ((𝐹‘𝐴) ∈ 𝐵 ∧ 𝐹 = {〈𝐴, (𝐹‘𝐴)〉}))) | |
| 2 | 1 | biimpa 481 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐹:{𝐴}⟶𝐵) → ((𝐹‘𝐴) ∈ 𝐵 ∧ 𝐹 = {〈𝐴, (𝐹‘𝐴)〉})) |
| 3 | 2 | simpld 499 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐹:{𝐴}⟶𝐵) → (𝐹‘𝐴) ∈ 𝐵) |
| 4 | f1sng 6865 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝐹‘𝐴) ∈ 𝐵) → {〈𝐴, (𝐹‘𝐴)〉}:{𝐴}–1-1→𝐵) | |
| 5 | 3, 4 | syldan 602 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐹:{𝐴}⟶𝐵) → {〈𝐴, (𝐹‘𝐴)〉}:{𝐴}–1-1→𝐵) |
| 6 | f1eq1 6770 | . . 3 ⊢ (𝐹 = {〈𝐴, (𝐹‘𝐴)〉} → (𝐹:{𝐴}–1-1→𝐵 ↔ {〈𝐴, (𝐹‘𝐴)〉}:{𝐴}–1-1→𝐵)) | |
| 7 | 2, 6 | simpl2im 512 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐹:{𝐴}⟶𝐵) → (𝐹:{𝐴}–1-1→𝐵 ↔ {〈𝐴, (𝐹‘𝐴)〉}:{𝐴}–1-1→𝐵)) |
| 8 | 5, 7 | mpbird 260 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐹:{𝐴}⟶𝐵) → 𝐹:{𝐴}–1-1→𝐵) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 209 ∧ wa 400 = wceq 1567 ∈ wcel 2149 {csn 4594 〈cop 4600 ⟶wf 6533 –1-1→wf1 6534 ‘cfv 6537 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-12 2219 ax-ext 2741 ax-sep 5261 ax-nul 5271 ax-pr 5405 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-ne 2965 df-ral 3086 df-rex 3096 df-reu 3377 df-rab 3424 df-v 3465 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-nul 4295 df-if 4493 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4877 df-br 5114 df-opab 5178 df-id 5557 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 |
| This theorem is referenced by: f1mo 49515 |
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