| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > ILE Home > Th. List > fvpr2 | GIF version | ||
| Description: The value of a function with a domain of two elements. (Contributed by Jeff Madsen, 20-Jun-2010.) |
| Ref | Expression |
|---|---|
| fvpr2.1 | ⊢ 𝐵 ∈ V |
| fvpr2.2 | ⊢ 𝐷 ∈ V |
| Ref | Expression |
|---|---|
| fvpr2 | ⊢ (𝐴 ≠ 𝐵 → ({〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉}‘𝐵) = 𝐷) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | prcom 3699 | . . 3 ⊢ {〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉} = {〈𝐵, 𝐷〉, 〈𝐴, 𝐶〉} | |
| 2 | 1 | fveq1i 5562 | . 2 ⊢ ({〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉}‘𝐵) = ({〈𝐵, 𝐷〉, 〈𝐴, 𝐶〉}‘𝐵) |
| 3 | necom 2451 | . . 3 ⊢ (𝐴 ≠ 𝐵 ↔ 𝐵 ≠ 𝐴) | |
| 4 | fvpr2.1 | . . . 4 ⊢ 𝐵 ∈ V | |
| 5 | fvpr2.2 | . . . 4 ⊢ 𝐷 ∈ V | |
| 6 | 4, 5 | fvpr1 5769 | . . 3 ⊢ (𝐵 ≠ 𝐴 → ({〈𝐵, 𝐷〉, 〈𝐴, 𝐶〉}‘𝐵) = 𝐷) |
| 7 | 3, 6 | sylbi 121 | . 2 ⊢ (𝐴 ≠ 𝐵 → ({〈𝐵, 𝐷〉, 〈𝐴, 𝐶〉}‘𝐵) = 𝐷) |
| 8 | 2, 7 | eqtrid 2241 | 1 ⊢ (𝐴 ≠ 𝐵 → ({〈𝐴, 𝐶〉, 〈𝐵, 𝐷〉}‘𝐵) = 𝐷) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1364 ∈ wcel 2167 ≠ wne 2367 Vcvv 2763 {cpr 3624 〈cop 3626 ‘cfv 5259 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-14 2170 ax-ext 2178 ax-sep 4152 ax-pow 4208 ax-pr 4243 |
| This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1475 df-sb 1777 df-eu 2048 df-mo 2049 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ne 2368 df-ral 2480 df-rex 2481 df-v 2765 df-sbc 2990 df-dif 3159 df-un 3161 df-in 3163 df-ss 3170 df-nul 3452 df-pw 3608 df-sn 3629 df-pr 3630 df-op 3632 df-uni 3841 df-br 4035 df-opab 4096 df-id 4329 df-xp 4670 df-rel 4671 df-cnv 4672 df-co 4673 df-dm 4674 df-res 4676 df-iota 5220 df-fun 5261 df-fv 5267 |
| This theorem is referenced by: (None) |
| Copyright terms: Public domain | W3C validator |