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| Mirrors > Home > MPE Home > Th. List > Mathboxes > fsetsnf1o | Structured version Visualization version GIF version | ||
| Description: The mapping of an element of a class to a singleton function is a bijection. (Contributed by AV, 13-Sep-2024.) |
| Ref | Expression |
|---|---|
| fsetsnf.a | ⊢ 𝐴 = {𝑦 ∣ ∃𝑏 ∈ 𝐵 𝑦 = {〈𝑆, 𝑏〉}} |
| fsetsnf.f | ⊢ 𝐹 = (𝑥 ∈ 𝐵 ↦ {〈𝑆, 𝑥〉}) |
| Ref | Expression |
|---|---|
| fsetsnf1o | ⊢ (𝑆 ∈ 𝑉 → 𝐹:𝐵–1-1-onto→𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fsetsnf.a | . . 3 ⊢ 𝐴 = {𝑦 ∣ ∃𝑏 ∈ 𝐵 𝑦 = {〈𝑆, 𝑏〉}} | |
| 2 | fsetsnf.f | . . 3 ⊢ 𝐹 = (𝑥 ∈ 𝐵 ↦ {〈𝑆, 𝑥〉}) | |
| 3 | 1, 2 | fsetsnf1 47516 | . 2 ⊢ (𝑆 ∈ 𝑉 → 𝐹:𝐵–1-1→𝐴) |
| 4 | 1, 2 | fsetsnfo 47517 | . 2 ⊢ (𝑆 ∈ 𝑉 → 𝐹:𝐵–onto→𝐴) |
| 5 | df-f1o 6501 | . 2 ⊢ (𝐹:𝐵–1-1-onto→𝐴 ↔ (𝐹:𝐵–1-1→𝐴 ∧ 𝐹:𝐵–onto→𝐴)) | |
| 6 | 3, 4, 5 | sylanbrc 584 | 1 ⊢ (𝑆 ∈ 𝑉 → 𝐹:𝐵–1-1-onto→𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1542 ∈ wcel 2114 {cab 2715 ∃wrex 3062 {csn 4568 〈cop 4574 ↦ cmpt 5167 –1-1→wf1 6491 –onto→wfo 6492 –1-1-onto→wf1o 6493 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5232 ax-nul 5242 ax-pr 5372 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-mpt 5168 df-id 5521 df-xp 5632 df-rel 5633 df-cnv 5634 df-co 5635 df-dm 5636 df-rn 5637 df-res 5638 df-ima 5639 df-iota 6450 df-fun 6496 df-fn 6497 df-f 6498 df-f1 6499 df-fo 6500 df-f1o 6501 df-fv 6502 |
| This theorem is referenced by: fsetsnprcnex 47519 |
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