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Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-pr22val | Structured version Visualization version GIF version |
Description: Value of the second projection of a couple. (Contributed by BJ, 6-Oct-2018.) |
Ref | Expression |
---|---|
bj-pr22val | ⊢ pr2 ⦅𝐴, 𝐵⦆ = 𝐵 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-bj-2upl 32192 | . . . 4 ⊢ ⦅𝐴, 𝐵⦆ = (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵)) | |
2 | bj-pr2eq 32197 | . . . 4 ⊢ (⦅𝐴, 𝐵⦆ = (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵)) → pr2 ⦅𝐴, 𝐵⦆ = pr2 (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵))) | |
3 | 1, 2 | ax-mp 5 | . . 3 ⊢ pr2 ⦅𝐴, 𝐵⦆ = pr2 (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵)) |
4 | bj-pr2un 32198 | . . 3 ⊢ pr2 (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵)) = (pr2 ⦅𝐴⦆ ∪ pr2 ({1𝑜} × tag 𝐵)) | |
5 | 3, 4 | eqtri 2632 | . 2 ⊢ pr2 ⦅𝐴, 𝐵⦆ = (pr2 ⦅𝐴⦆ ∪ pr2 ({1𝑜} × tag 𝐵)) |
6 | df-bj-1upl 32179 | . . . . 5 ⊢ ⦅𝐴⦆ = ({∅} × tag 𝐴) | |
7 | bj-pr2eq 32197 | . . . . 5 ⊢ (⦅𝐴⦆ = ({∅} × tag 𝐴) → pr2 ⦅𝐴⦆ = pr2 ({∅} × tag 𝐴)) | |
8 | 6, 7 | ax-mp 5 | . . . 4 ⊢ pr2 ⦅𝐴⦆ = pr2 ({∅} × tag 𝐴) |
9 | bj-pr2val 32199 | . . . 4 ⊢ pr2 ({∅} × tag 𝐴) = if(∅ = 1𝑜, 𝐴, ∅) | |
10 | 1n0 7462 | . . . . . 6 ⊢ 1𝑜 ≠ ∅ | |
11 | 10 | nesymi 2839 | . . . . 5 ⊢ ¬ ∅ = 1𝑜 |
12 | 11 | iffalsei 4046 | . . . 4 ⊢ if(∅ = 1𝑜, 𝐴, ∅) = ∅ |
13 | 8, 9, 12 | 3eqtri 2636 | . . 3 ⊢ pr2 ⦅𝐴⦆ = ∅ |
14 | bj-pr2val 32199 | . . . 4 ⊢ pr2 ({1𝑜} × tag 𝐵) = if(1𝑜 = 1𝑜, 𝐵, ∅) | |
15 | eqid 2610 | . . . . 5 ⊢ 1𝑜 = 1𝑜 | |
16 | 15 | iftruei 4043 | . . . 4 ⊢ if(1𝑜 = 1𝑜, 𝐵, ∅) = 𝐵 |
17 | 14, 16 | eqtri 2632 | . . 3 ⊢ pr2 ({1𝑜} × tag 𝐵) = 𝐵 |
18 | 13, 17 | uneq12i 3727 | . 2 ⊢ (pr2 ⦅𝐴⦆ ∪ pr2 ({1𝑜} × tag 𝐵)) = (∅ ∪ 𝐵) |
19 | uncom 3719 | . . 3 ⊢ (∅ ∪ 𝐵) = (𝐵 ∪ ∅) | |
20 | un0 3919 | . . 3 ⊢ (𝐵 ∪ ∅) = 𝐵 | |
21 | 19, 20 | eqtri 2632 | . 2 ⊢ (∅ ∪ 𝐵) = 𝐵 |
22 | 5, 18, 21 | 3eqtri 2636 | 1 ⊢ pr2 ⦅𝐴, 𝐵⦆ = 𝐵 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1475 ∪ cun 3538 ∅c0 3874 ifcif 4036 {csn 4125 × cxp 5036 1𝑜c1o 7440 tag bj-ctag 32155 ⦅bj-c1upl 32178 ⦅bj-c2uple 32191 pr2 bj-cpr2 32195 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pr 4833 ax-un 6847 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-nel 2783 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-opab 4644 df-xp 5044 df-rel 5045 df-cnv 5046 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-suc 5646 df-1o 7447 df-bj-sngl 32147 df-bj-tag 32156 df-bj-proj 32172 df-bj-1upl 32179 df-bj-2upl 32192 df-bj-pr2 32196 |
This theorem is referenced by: bj-2uplth 32202 bj-2uplex 32203 |
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