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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 5668 | . . . . 5 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → {〈𝐴, 𝐵〉} = (𝑥 ∈ {𝐴} ↦ 𝐵)) | |
4 | 1, 2, 3 | mp2an 423 | . . . 4 ⊢ {〈𝐴, 𝐵〉} = (𝑥 ∈ {𝐴} ↦ 𝐵) |
5 | elsni 3588 | . . . . . 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 4062 | . . . 4 ⊢ (𝑥 ∈ {𝐴} ↦ 𝐶) = (𝑥 ∈ {𝐴} ↦ 𝐵) |
9 | 4, 8 | eqtr4i 2188 | . . 3 ⊢ {〈𝐴, 𝐵〉} = (𝑥 ∈ {𝐴} ↦ 𝐶) |
10 | 9 | uneq2i 3268 | . 2 ⊢ ((𝑥 ∈ 𝑅 ↦ 𝐶) ∪ {〈𝐴, 𝐵〉}) = ((𝑥 ∈ 𝑅 ↦ 𝐶) ∪ (𝑥 ∈ {𝐴} ↦ 𝐶)) |
11 | mptun 5313 | . 2 ⊢ (𝑥 ∈ (𝑅 ∪ {𝐴}) ↦ 𝐶) = ((𝑥 ∈ 𝑅 ↦ 𝐶) ∪ (𝑥 ∈ {𝐴} ↦ 𝐶)) | |
12 | fmptap.1 | . . 3 ⊢ (𝑅 ∪ {𝐴}) = 𝑆 | |
13 | mpteq1 4060 | . . 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 2191 | 1 ⊢ ((𝑥 ∈ 𝑅 ↦ 𝐶) ∪ {〈𝐴, 𝐵〉}) = (𝑥 ∈ 𝑆 ↦ 𝐶) |
Colors of variables: wff set class |
Syntax hints: → wi 4 = wceq 1342 ∈ wcel 2135 Vcvv 2721 ∪ cun 3109 {csn 3570 〈cop 3573 ↦ cmpt 4037 |
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 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-14 2138 ax-ext 2146 ax-sep 4094 ax-pow 4147 ax-pr 4181 |
This theorem depends on definitions: df-bi 116 df-3an 969 df-tru 1345 df-nf 1448 df-sb 1750 df-eu 2016 df-mo 2017 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-ral 2447 df-rex 2448 df-reu 2449 df-v 2723 df-un 3115 df-in 3117 df-ss 3124 df-pw 3555 df-sn 3576 df-pr 3577 df-op 3579 df-br 3977 df-opab 4038 df-mpt 4039 df-id 4265 df-xp 4604 df-rel 4605 df-cnv 4606 df-co 4607 df-dm 4608 df-rn 4609 df-fun 5184 df-fn 5185 df-f 5186 df-f1 5187 df-fo 5188 df-f1o 5189 |
This theorem is referenced by: (None) |
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