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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 8656 | . 2 ⊢ 1o ∈ ω | |
| 2 | 1n0 8502 | . . 3 ⊢ 1o ≠ ∅ | |
| 3 | 2 | necomi 3009 | . 2 ⊢ ∅ ≠ 1o |
| 4 | fvpr2g 7200 | . 2 ⊢ ((1o ∈ ω ∧ 𝐵 ∈ 𝑉 ∧ ∅ ≠ 1o) → ({〈∅, 𝐴〉, 〈1o, 𝐵〉}‘1o) = 𝐵) | |
| 5 | 1, 3, 4 | mp3an13 1481 | 1 ⊢ (𝐵 ∈ 𝑉 → ({〈∅, 𝐴〉, 〈1o, 𝐵〉}‘1o) = 𝐵) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1569 ∈ wcel 2144 ≠ wne 2955 ∅c0 4277 {cpr 4586 〈cop 4834 ‘cfv 6543 ωcom 7881 1oc1o 8476 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pr 5391 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3897 df-pss 4013 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-tr 5212 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-res 5663 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6497 df-fun 6545 df-fv 6551 df-om 7882 df-1o 8483 |
| This theorem is used by: fvprif 17742 xpsfeq 17744 xpsfrnel2 17745 xpsff1o 17748 xpsle 17760 dmdprdpr 20274 dprdpr 20275 xpstopnlem1 24137 xpstopnlem2 24139 xpsxmetlem 24707 xpsdsval 24709 xpsmet 24710 |
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