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Mirrors > Home > MPE Home > Th. List > residpr | Structured version Visualization version GIF version |
Description: Restriction of the identity to a pair. (Contributed by AV, 11-Dec-2018.) |
Ref | Expression |
---|---|
residpr | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ( I ↾ {𝐴, 𝐵}) = {〈𝐴, 𝐴〉, 〈𝐵, 𝐵〉}) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-pr 4528 | . . . 4 ⊢ {𝐴, 𝐵} = ({𝐴} ∪ {𝐵}) | |
2 | 1 | reseq2i 5815 | . . 3 ⊢ ( I ↾ {𝐴, 𝐵}) = ( I ↾ ({𝐴} ∪ {𝐵})) |
3 | resundi 5832 | . . 3 ⊢ ( I ↾ ({𝐴} ∪ {𝐵})) = (( I ↾ {𝐴}) ∪ ( I ↾ {𝐵})) | |
4 | 2, 3 | eqtri 2821 | . 2 ⊢ ( I ↾ {𝐴, 𝐵}) = (( I ↾ {𝐴}) ∪ ( I ↾ {𝐵})) |
5 | xpsng 6878 | . . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐴 ∈ 𝑉) → ({𝐴} × {𝐴}) = {〈𝐴, 𝐴〉}) | |
6 | 5 | anidms 570 | . . . . 5 ⊢ (𝐴 ∈ 𝑉 → ({𝐴} × {𝐴}) = {〈𝐴, 𝐴〉}) |
7 | 6 | adantr 484 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ({𝐴} × {𝐴}) = {〈𝐴, 𝐴〉}) |
8 | xpsng 6878 | . . . . . 6 ⊢ ((𝐵 ∈ 𝑊 ∧ 𝐵 ∈ 𝑊) → ({𝐵} × {𝐵}) = {〈𝐵, 𝐵〉}) | |
9 | 8 | anidms 570 | . . . . 5 ⊢ (𝐵 ∈ 𝑊 → ({𝐵} × {𝐵}) = {〈𝐵, 𝐵〉}) |
10 | 9 | adantl 485 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ({𝐵} × {𝐵}) = {〈𝐵, 𝐵〉}) |
11 | 7, 10 | uneq12d 4091 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (({𝐴} × {𝐴}) ∪ ({𝐵} × {𝐵})) = ({〈𝐴, 𝐴〉} ∪ {〈𝐵, 𝐵〉})) |
12 | restidsing 5889 | . . . 4 ⊢ ( I ↾ {𝐴}) = ({𝐴} × {𝐴}) | |
13 | restidsing 5889 | . . . 4 ⊢ ( I ↾ {𝐵}) = ({𝐵} × {𝐵}) | |
14 | 12, 13 | uneq12i 4088 | . . 3 ⊢ (( I ↾ {𝐴}) ∪ ( I ↾ {𝐵})) = (({𝐴} × {𝐴}) ∪ ({𝐵} × {𝐵})) |
15 | df-pr 4528 | . . 3 ⊢ {〈𝐴, 𝐴〉, 〈𝐵, 𝐵〉} = ({〈𝐴, 𝐴〉} ∪ {〈𝐵, 𝐵〉}) | |
16 | 11, 14, 15 | 3eqtr4g 2858 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (( I ↾ {𝐴}) ∪ ( I ↾ {𝐵})) = {〈𝐴, 𝐴〉, 〈𝐵, 𝐵〉}) |
17 | 4, 16 | syl5eq 2845 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ( I ↾ {𝐴, 𝐵}) = {〈𝐴, 𝐴〉, 〈𝐵, 𝐵〉}) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 = wceq 1538 ∈ wcel 2111 ∪ cun 3879 {csn 4525 {cpr 4527 〈cop 4531 I cid 5424 × cxp 5517 ↾ cres 5521 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pr 5295 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-ral 3111 df-rex 3112 df-reu 3113 df-rab 3115 df-v 3443 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-if 4426 df-sn 4526 df-pr 4528 df-op 4532 df-br 5031 df-opab 5093 df-mpt 5111 df-id 5425 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-fun 6326 df-fn 6327 df-f 6328 df-f1 6329 df-fo 6330 df-f1o 6331 |
This theorem is referenced by: psgnprfval1 18642 |
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