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| Mirrors > Home > ILE Home > Th. List > fvunsng | GIF version | ||
| Description: Remove an ordered pair not participating in a function value. (Contributed by Jim Kingdon, 7-Jan-2019.) |
| Ref | Expression |
|---|---|
| fvunsng | ⊢ ((𝐷 ∈ 𝑉 ∧ 𝐵 ≠ 𝐷) → ((𝐴 ∪ {〈𝐵, 𝐶〉})‘𝐷) = (𝐴‘𝐷)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | snidg 3702 | . . . 4 ⊢ (𝐷 ∈ 𝑉 → 𝐷 ∈ {𝐷}) | |
| 2 | fvres 5672 | . . . 4 ⊢ (𝐷 ∈ {𝐷} → (((𝐴 ∪ {〈𝐵, 𝐶〉}) ↾ {𝐷})‘𝐷) = ((𝐴 ∪ {〈𝐵, 𝐶〉})‘𝐷)) | |
| 3 | 1, 2 | syl 14 | . . 3 ⊢ (𝐷 ∈ 𝑉 → (((𝐴 ∪ {〈𝐵, 𝐶〉}) ↾ {𝐷})‘𝐷) = ((𝐴 ∪ {〈𝐵, 𝐶〉})‘𝐷)) |
| 4 | resundir 5033 | . . . . 5 ⊢ ((𝐴 ∪ {〈𝐵, 𝐶〉}) ↾ {𝐷}) = ((𝐴 ↾ {𝐷}) ∪ ({〈𝐵, 𝐶〉} ↾ {𝐷})) | |
| 5 | elsni 3691 | . . . . . . . . 9 ⊢ (𝐵 ∈ {𝐷} → 𝐵 = 𝐷) | |
| 6 | 5 | necon3ai 2452 | . . . . . . . 8 ⊢ (𝐵 ≠ 𝐷 → ¬ 𝐵 ∈ {𝐷}) |
| 7 | ressnop0 5843 | . . . . . . . 8 ⊢ (¬ 𝐵 ∈ {𝐷} → ({〈𝐵, 𝐶〉} ↾ {𝐷}) = ∅) | |
| 8 | 6, 7 | syl 14 | . . . . . . 7 ⊢ (𝐵 ≠ 𝐷 → ({〈𝐵, 𝐶〉} ↾ {𝐷}) = ∅) |
| 9 | 8 | uneq2d 3363 | . . . . . 6 ⊢ (𝐵 ≠ 𝐷 → ((𝐴 ↾ {𝐷}) ∪ ({〈𝐵, 𝐶〉} ↾ {𝐷})) = ((𝐴 ↾ {𝐷}) ∪ ∅)) |
| 10 | un0 3530 | . . . . . 6 ⊢ ((𝐴 ↾ {𝐷}) ∪ ∅) = (𝐴 ↾ {𝐷}) | |
| 11 | 9, 10 | eqtrdi 2280 | . . . . 5 ⊢ (𝐵 ≠ 𝐷 → ((𝐴 ↾ {𝐷}) ∪ ({〈𝐵, 𝐶〉} ↾ {𝐷})) = (𝐴 ↾ {𝐷})) |
| 12 | 4, 11 | eqtrid 2276 | . . . 4 ⊢ (𝐵 ≠ 𝐷 → ((𝐴 ∪ {〈𝐵, 𝐶〉}) ↾ {𝐷}) = (𝐴 ↾ {𝐷})) |
| 13 | 12 | fveq1d 5650 | . . 3 ⊢ (𝐵 ≠ 𝐷 → (((𝐴 ∪ {〈𝐵, 𝐶〉}) ↾ {𝐷})‘𝐷) = ((𝐴 ↾ {𝐷})‘𝐷)) |
| 14 | 3, 13 | sylan9req 2285 | . 2 ⊢ ((𝐷 ∈ 𝑉 ∧ 𝐵 ≠ 𝐷) → ((𝐴 ∪ {〈𝐵, 𝐶〉})‘𝐷) = ((𝐴 ↾ {𝐷})‘𝐷)) |
| 15 | fvres 5672 | . . . 4 ⊢ (𝐷 ∈ {𝐷} → ((𝐴 ↾ {𝐷})‘𝐷) = (𝐴‘𝐷)) | |
| 16 | 1, 15 | syl 14 | . . 3 ⊢ (𝐷 ∈ 𝑉 → ((𝐴 ↾ {𝐷})‘𝐷) = (𝐴‘𝐷)) |
| 17 | 16 | adantr 276 | . 2 ⊢ ((𝐷 ∈ 𝑉 ∧ 𝐵 ≠ 𝐷) → ((𝐴 ↾ {𝐷})‘𝐷) = (𝐴‘𝐷)) |
| 18 | 14, 17 | eqtrd 2264 | 1 ⊢ ((𝐷 ∈ 𝑉 ∧ 𝐵 ≠ 𝐷) → ((𝐴 ∪ {〈𝐵, 𝐶〉})‘𝐷) = (𝐴‘𝐷)) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 = wceq 1398 ∈ wcel 2202 ≠ wne 2403 ∪ cun 3199 ∅c0 3496 {csn 3673 〈cop 3676 ↾ cres 4733 ‘cfv 5333 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-14 2205 ax-ext 2213 ax-sep 4212 ax-pow 4270 ax-pr 4305 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ne 2404 df-ral 2516 df-rex 2517 df-v 2805 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-nul 3497 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-uni 3899 df-br 4094 df-opab 4156 df-xp 4737 df-res 4743 df-iota 5293 df-fv 5341 |
| This theorem is referenced by: fvpr1 5866 fvpr1g 5868 fvpr2g 5869 fvtp1g 5870 tfrlemisucaccv 6534 tfr1onlemsucaccv 6550 tfrcllemsucaccv 6563 ac6sfi 7130 0tonninf 10748 1tonninf 10749 hashennn 11088 zfz1isolemiso 11149 cats1un 11351 nninfctlemfo 12674 |
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