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Mirrors > Home > ILE Home > Th. List > fmptap | GIF version |
Description: Append an additional value to a function. (Contributed by NM, 6-Jun-2006.) (Revised by Mario Carneiro, 31-Aug-2015.) |
Ref | Expression |
---|---|
fmptap.0a | ⊢ 𝐴 ∈ V |
fmptap.0b | ⊢ 𝐵 ∈ V |
fmptap.1 | ⊢ (𝑅 ∪ {𝐴}) = 𝑆 |
fmptap.2 | ⊢ (𝑥 = 𝐴 → 𝐶 = 𝐵) |
Ref | Expression |
---|---|
fmptap | ⊢ ((𝑥 ∈ 𝑅 ↦ 𝐶) ∪ {〈𝐴, 𝐵〉}) = (𝑥 ∈ 𝑆 ↦ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fmptap.0a | . . . . 5 ⊢ 𝐴 ∈ V | |
2 | fmptap.0b | . . . . 5 ⊢ 𝐵 ∈ V | |
3 | fmptsn 5602 | . . . . 5 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → {〈𝐴, 𝐵〉} = (𝑥 ∈ {𝐴} ↦ 𝐵)) | |
4 | 1, 2, 3 | mp2an 422 | . . . 4 ⊢ {〈𝐴, 𝐵〉} = (𝑥 ∈ {𝐴} ↦ 𝐵) |
5 | elsni 3540 | . . . . . 6 ⊢ (𝑥 ∈ {𝐴} → 𝑥 = 𝐴) | |
6 | fmptap.2 | . . . . . 6 ⊢ (𝑥 = 𝐴 → 𝐶 = 𝐵) | |
7 | 5, 6 | syl 14 | . . . . 5 ⊢ (𝑥 ∈ {𝐴} → 𝐶 = 𝐵) |
8 | 7 | mpteq2ia 4009 | . . . 4 ⊢ (𝑥 ∈ {𝐴} ↦ 𝐶) = (𝑥 ∈ {𝐴} ↦ 𝐵) |
9 | 4, 8 | eqtr4i 2161 | . . 3 ⊢ {〈𝐴, 𝐵〉} = (𝑥 ∈ {𝐴} ↦ 𝐶) |
10 | 9 | uneq2i 3222 | . 2 ⊢ ((𝑥 ∈ 𝑅 ↦ 𝐶) ∪ {〈𝐴, 𝐵〉}) = ((𝑥 ∈ 𝑅 ↦ 𝐶) ∪ (𝑥 ∈ {𝐴} ↦ 𝐶)) |
11 | mptun 5249 | . 2 ⊢ (𝑥 ∈ (𝑅 ∪ {𝐴}) ↦ 𝐶) = ((𝑥 ∈ 𝑅 ↦ 𝐶) ∪ (𝑥 ∈ {𝐴} ↦ 𝐶)) | |
12 | fmptap.1 | . . 3 ⊢ (𝑅 ∪ {𝐴}) = 𝑆 | |
13 | mpteq1 4007 | . . 3 ⊢ ((𝑅 ∪ {𝐴}) = 𝑆 → (𝑥 ∈ (𝑅 ∪ {𝐴}) ↦ 𝐶) = (𝑥 ∈ 𝑆 ↦ 𝐶)) | |
14 | 12, 13 | ax-mp 5 | . 2 ⊢ (𝑥 ∈ (𝑅 ∪ {𝐴}) ↦ 𝐶) = (𝑥 ∈ 𝑆 ↦ 𝐶) |
15 | 10, 11, 14 | 3eqtr2i 2164 | 1 ⊢ ((𝑥 ∈ 𝑅 ↦ 𝐶) ∪ {〈𝐴, 𝐵〉}) = (𝑥 ∈ 𝑆 ↦ 𝐶) |
Colors of variables: wff set class |
Syntax hints: → wi 4 = wceq 1331 ∈ wcel 1480 Vcvv 2681 ∪ cun 3064 {csn 3522 〈cop 3525 ↦ cmpt 3984 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 ax-pow 4093 ax-pr 4126 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-eu 2000 df-mo 2001 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ral 2419 df-rex 2420 df-reu 2421 df-v 2683 df-un 3070 df-in 3072 df-ss 3079 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-br 3925 df-opab 3985 df-mpt 3986 df-id 4210 df-xp 4540 df-rel 4541 df-cnv 4542 df-co 4543 df-dm 4544 df-rn 4545 df-fun 5120 df-fn 5121 df-f 5122 df-f1 5123 df-fo 5124 df-f1o 5125 |
This theorem is referenced by: (None) |
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