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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 4563 | . . . 4 ⊢ {𝐴, 𝐵} = ({𝐴} ∪ {𝐵}) | |
2 | 1 | reseq2i 5844 | . . 3 ⊢ ( I ↾ {𝐴, 𝐵}) = ( I ↾ ({𝐴} ∪ {𝐵})) |
3 | resundi 5861 | . . 3 ⊢ ( I ↾ ({𝐴} ∪ {𝐵})) = (( I ↾ {𝐴}) ∪ ( I ↾ {𝐵})) | |
4 | 2, 3 | eqtri 2844 | . 2 ⊢ ( I ↾ {𝐴, 𝐵}) = (( I ↾ {𝐴}) ∪ ( I ↾ {𝐵})) |
5 | xpsng 6895 | . . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐴 ∈ 𝑉) → ({𝐴} × {𝐴}) = {〈𝐴, 𝐴〉}) | |
6 | 5 | anidms 569 | . . . . 5 ⊢ (𝐴 ∈ 𝑉 → ({𝐴} × {𝐴}) = {〈𝐴, 𝐴〉}) |
7 | 6 | adantr 483 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ({𝐴} × {𝐴}) = {〈𝐴, 𝐴〉}) |
8 | xpsng 6895 | . . . . . 6 ⊢ ((𝐵 ∈ 𝑊 ∧ 𝐵 ∈ 𝑊) → ({𝐵} × {𝐵}) = {〈𝐵, 𝐵〉}) | |
9 | 8 | anidms 569 | . . . . 5 ⊢ (𝐵 ∈ 𝑊 → ({𝐵} × {𝐵}) = {〈𝐵, 𝐵〉}) |
10 | 9 | adantl 484 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ({𝐵} × {𝐵}) = {〈𝐵, 𝐵〉}) |
11 | 7, 10 | uneq12d 4139 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (({𝐴} × {𝐴}) ∪ ({𝐵} × {𝐵})) = ({〈𝐴, 𝐴〉} ∪ {〈𝐵, 𝐵〉})) |
12 | restidsing 5916 | . . . 4 ⊢ ( I ↾ {𝐴}) = ({𝐴} × {𝐴}) | |
13 | restidsing 5916 | . . . 4 ⊢ ( I ↾ {𝐵}) = ({𝐵} × {𝐵}) | |
14 | 12, 13 | uneq12i 4136 | . . 3 ⊢ (( I ↾ {𝐴}) ∪ ( I ↾ {𝐵})) = (({𝐴} × {𝐴}) ∪ ({𝐵} × {𝐵})) |
15 | df-pr 4563 | . . 3 ⊢ {〈𝐴, 𝐴〉, 〈𝐵, 𝐵〉} = ({〈𝐴, 𝐴〉} ∪ {〈𝐵, 𝐵〉}) | |
16 | 11, 14, 15 | 3eqtr4g 2881 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (( I ↾ {𝐴}) ∪ ( I ↾ {𝐵})) = {〈𝐴, 𝐴〉, 〈𝐵, 𝐵〉}) |
17 | 4, 16 | syl5eq 2868 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ( I ↾ {𝐴, 𝐵}) = {〈𝐴, 𝐴〉, 〈𝐵, 𝐵〉}) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1533 ∈ wcel 2110 ∪ cun 3933 {csn 4560 {cpr 4562 〈cop 4566 I cid 5453 × cxp 5547 ↾ cres 5551 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5195 ax-nul 5202 ax-pr 5321 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-nul 4291 df-if 4467 df-sn 4561 df-pr 4563 df-op 4567 df-br 5059 df-opab 5121 df-mpt 5139 df-id 5454 df-xp 5555 df-rel 5556 df-cnv 5557 df-co 5558 df-dm 5559 df-rn 5560 df-res 5561 df-fun 6351 df-fn 6352 df-f 6353 df-f1 6354 df-fo 6355 df-f1o 6356 |
This theorem is referenced by: psgnprfval1 18644 |
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