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Mirrors > Home > MPE Home > Th. List > fvunsn | Structured version Visualization version GIF version |
Description: Remove an ordered pair not participating in a function value. (Contributed by NM, 1-Oct-2013.) (Revised by Mario Carneiro, 28-May-2014.) |
Ref | Expression |
---|---|
fvunsn | ⊢ (𝐵 ≠ 𝐷 → ((𝐴 ∪ {〈𝐵, 𝐶〉})‘𝐷) = (𝐴‘𝐷)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | resundir 5570 | . . . 4 ⊢ ((𝐴 ∪ {〈𝐵, 𝐶〉}) ↾ {𝐷}) = ((𝐴 ↾ {𝐷}) ∪ ({〈𝐵, 𝐶〉} ↾ {𝐷})) | |
2 | nelsn 4358 | . . . . . . 7 ⊢ (𝐵 ≠ 𝐷 → ¬ 𝐵 ∈ {𝐷}) | |
3 | ressnop0 6585 | . . . . . . 7 ⊢ (¬ 𝐵 ∈ {𝐷} → ({〈𝐵, 𝐶〉} ↾ {𝐷}) = ∅) | |
4 | 2, 3 | syl 17 | . . . . . 6 ⊢ (𝐵 ≠ 𝐷 → ({〈𝐵, 𝐶〉} ↾ {𝐷}) = ∅) |
5 | 4 | uneq2d 3911 | . . . . 5 ⊢ (𝐵 ≠ 𝐷 → ((𝐴 ↾ {𝐷}) ∪ ({〈𝐵, 𝐶〉} ↾ {𝐷})) = ((𝐴 ↾ {𝐷}) ∪ ∅)) |
6 | un0 4111 | . . . . 5 ⊢ ((𝐴 ↾ {𝐷}) ∪ ∅) = (𝐴 ↾ {𝐷}) | |
7 | 5, 6 | syl6eq 2811 | . . . 4 ⊢ (𝐵 ≠ 𝐷 → ((𝐴 ↾ {𝐷}) ∪ ({〈𝐵, 𝐶〉} ↾ {𝐷})) = (𝐴 ↾ {𝐷})) |
8 | 1, 7 | syl5eq 2807 | . . 3 ⊢ (𝐵 ≠ 𝐷 → ((𝐴 ∪ {〈𝐵, 𝐶〉}) ↾ {𝐷}) = (𝐴 ↾ {𝐷})) |
9 | 8 | fveq1d 6356 | . 2 ⊢ (𝐵 ≠ 𝐷 → (((𝐴 ∪ {〈𝐵, 𝐶〉}) ↾ {𝐷})‘𝐷) = ((𝐴 ↾ {𝐷})‘𝐷)) |
10 | fvressn 6594 | . . 3 ⊢ (𝐷 ∈ V → (((𝐴 ∪ {〈𝐵, 𝐶〉}) ↾ {𝐷})‘𝐷) = ((𝐴 ∪ {〈𝐵, 𝐶〉})‘𝐷)) | |
11 | fvprc 6348 | . . . 4 ⊢ (¬ 𝐷 ∈ V → (((𝐴 ∪ {〈𝐵, 𝐶〉}) ↾ {𝐷})‘𝐷) = ∅) | |
12 | fvprc 6348 | . . . 4 ⊢ (¬ 𝐷 ∈ V → ((𝐴 ∪ {〈𝐵, 𝐶〉})‘𝐷) = ∅) | |
13 | 11, 12 | eqtr4d 2798 | . . 3 ⊢ (¬ 𝐷 ∈ V → (((𝐴 ∪ {〈𝐵, 𝐶〉}) ↾ {𝐷})‘𝐷) = ((𝐴 ∪ {〈𝐵, 𝐶〉})‘𝐷)) |
14 | 10, 13 | pm2.61i 176 | . 2 ⊢ (((𝐴 ∪ {〈𝐵, 𝐶〉}) ↾ {𝐷})‘𝐷) = ((𝐴 ∪ {〈𝐵, 𝐶〉})‘𝐷) |
15 | fvressn 6594 | . . 3 ⊢ (𝐷 ∈ V → ((𝐴 ↾ {𝐷})‘𝐷) = (𝐴‘𝐷)) | |
16 | fvprc 6348 | . . . 4 ⊢ (¬ 𝐷 ∈ V → ((𝐴 ↾ {𝐷})‘𝐷) = ∅) | |
17 | fvprc 6348 | . . . 4 ⊢ (¬ 𝐷 ∈ V → (𝐴‘𝐷) = ∅) | |
18 | 16, 17 | eqtr4d 2798 | . . 3 ⊢ (¬ 𝐷 ∈ V → ((𝐴 ↾ {𝐷})‘𝐷) = (𝐴‘𝐷)) |
19 | 15, 18 | pm2.61i 176 | . 2 ⊢ ((𝐴 ↾ {𝐷})‘𝐷) = (𝐴‘𝐷) |
20 | 9, 14, 19 | 3eqtr3g 2818 | 1 ⊢ (𝐵 ≠ 𝐷 → ((𝐴 ∪ {〈𝐵, 𝐶〉})‘𝐷) = (𝐴‘𝐷)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 = wceq 1632 ∈ wcel 2140 ≠ wne 2933 Vcvv 3341 ∪ cun 3714 ∅c0 4059 {csn 4322 〈cop 4328 ↾ cres 5269 ‘cfv 6050 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1871 ax-4 1886 ax-5 1989 ax-6 2055 ax-7 2091 ax-8 2142 ax-9 2149 ax-10 2169 ax-11 2184 ax-12 2197 ax-13 2392 ax-ext 2741 ax-sep 4934 ax-nul 4942 ax-pow 4993 ax-pr 5056 |
This theorem depends on definitions: df-bi 197 df-or 384 df-an 385 df-3an 1074 df-tru 1635 df-ex 1854 df-nf 1859 df-sb 2048 df-eu 2612 df-mo 2613 df-clab 2748 df-cleq 2754 df-clel 2757 df-nfc 2892 df-ne 2934 df-ral 3056 df-rex 3057 df-rab 3060 df-v 3343 df-dif 3719 df-un 3721 df-in 3723 df-ss 3730 df-nul 4060 df-if 4232 df-sn 4323 df-pr 4325 df-op 4329 df-uni 4590 df-br 4806 df-opab 4866 df-xp 5273 df-res 5279 df-iota 6013 df-fv 6058 |
This theorem is referenced by: fvpr1 6622 fvpr1g 6624 fvpr2g 6625 fvtp1 6626 fvtp1g 6629 ac6sfi 8372 cats1un 13696 ruclem6 15184 ruclem7 15185 wlkp1lem5 26806 wlkp1lem6 26807 fnchoice 39706 nnsum4primeseven 42217 nnsum4primesevenALTV 42218 |
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