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| Mirrors > Home > MPE Home > Th. List > fvpr0o | 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 |
|---|---|
| fvpr0o | ⊢ (𝐴 ∈ 𝑉 → ({〈∅, 𝐴〉, 〈1o, 𝐵〉}‘∅) = 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | peano1 7868 | . 2 ⊢ ∅ ∈ ω | |
| 2 | 1n0 8455 | . . 3 ⊢ 1o ≠ ∅ | |
| 3 | 2 | necomi 2980 | . 2 ⊢ ∅ ≠ 1o |
| 4 | fvpr1g 7167 | . 2 ⊢ ((∅ ∈ ω ∧ 𝐴 ∈ 𝑉 ∧ ∅ ≠ 1o) → ({〈∅, 𝐴〉, 〈1o, 𝐵〉}‘∅) = 𝐴) | |
| 5 | 1, 3, 4 | mp3an13 1454 | 1 ⊢ (𝐴 ∈ 𝑉 → ({〈∅, 𝐴〉, 〈1o, 𝐵〉}‘∅) = 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1540 ∈ wcel 2109 ≠ wne 2926 ∅c0 4299 {cpr 4594 〈cop 4598 ‘cfv 6514 ωcom 7845 1oc1o 8430 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-sep 5254 ax-nul 5264 ax-pr 5390 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-ne 2927 df-ral 3046 df-rex 3055 df-rab 3409 df-v 3452 df-dif 3920 df-un 3922 df-in 3924 df-ss 3934 df-pss 3937 df-nul 4300 df-if 4492 df-pw 4568 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4875 df-br 5111 df-opab 5173 df-tr 5218 df-id 5536 df-eprel 5541 df-po 5549 df-so 5550 df-fr 5594 df-we 5596 df-xp 5647 df-rel 5648 df-cnv 5649 df-co 5650 df-dm 5651 df-res 5653 df-ord 6338 df-on 6339 df-lim 6340 df-suc 6341 df-iota 6467 df-fun 6516 df-fv 6522 df-om 7846 df-1o 8437 |
| This theorem is referenced by: fvprif 17531 xpsfeq 17533 xpsfrnel2 17534 xpsff1o 17537 xpsle 17549 dmdprdpr 19988 dprdpr 19989 xpstopnlem1 23703 xpstopnlem2 23705 xpsxmetlem 24274 xpsdsval 24276 xpsmet 24277 |
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