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| Mirrors > Home > MPE Home > Th. List > fvpr1o | Structured version Visualization version GIF version | ||
| Description: The value of a function with a domain of (at most) two elements. (Contributed by Jim Kingdon, 25-Sep-2023.) |
| Ref | Expression |
|---|---|
| fvpr1o | ⊢ (𝐵 ∈ 𝑉 → ({〈∅, 𝐴〉, 〈1o, 𝐵〉}‘1o) = 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1onn 8564 | . 2 ⊢ 1o ∈ ω | |
| 2 | 1n0 8412 | . . 3 ⊢ 1o ≠ ∅ | |
| 3 | 2 | necomi 2983 | . 2 ⊢ ∅ ≠ 1o |
| 4 | fvpr2g 7134 | . 2 ⊢ ((1o ∈ ω ∧ 𝐵 ∈ 𝑉 ∧ ∅ ≠ 1o) → ({〈∅, 𝐴〉, 〈1o, 𝐵〉}‘1o) = 𝐵) | |
| 5 | 1, 3, 4 | mp3an13 1454 | 1 ⊢ (𝐵 ∈ 𝑉 → ({〈∅, 𝐴〉, 〈1o, 𝐵〉}‘1o) = 𝐵) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1541 ∈ wcel 2113 ≠ wne 2929 ∅c0 4282 {cpr 4579 〈cop 4583 ‘cfv 6489 ωcom 7805 1oc1o 8387 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-12 2182 ax-ext 2705 ax-sep 5238 ax-nul 5248 ax-pr 5374 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2725 df-clel 2808 df-ne 2930 df-ral 3049 df-rex 3058 df-rab 3397 df-v 3439 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-pss 3918 df-nul 4283 df-if 4477 df-pw 4553 df-sn 4578 df-pr 4580 df-op 4584 df-uni 4861 df-br 5096 df-opab 5158 df-tr 5203 df-id 5516 df-eprel 5521 df-po 5529 df-so 5530 df-fr 5574 df-we 5576 df-xp 5627 df-rel 5628 df-cnv 5629 df-co 5630 df-dm 5631 df-res 5633 df-ord 6317 df-on 6318 df-lim 6319 df-suc 6320 df-iota 6445 df-fun 6491 df-fv 6497 df-om 7806 df-1o 8394 |
| This theorem is referenced by: fvprif 17473 xpsfeq 17475 xpsfrnel2 17476 xpsff1o 17479 xpsle 17491 dmdprdpr 19971 dprdpr 19972 xpstopnlem1 23744 xpstopnlem2 23746 xpsxmetlem 24314 xpsdsval 24316 xpsmet 24317 |
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