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Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-pr2val | Structured version Visualization version GIF version |
Description: Value of the second projection. (Contributed by BJ, 6-Apr-2019.) |
Ref | Expression |
---|---|
bj-pr2val | ⊢ pr2 ({𝐴} × tag 𝐵) = if(𝐴 = 1o, 𝐵, ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-bj-pr2 33951 | . 2 ⊢ pr2 ({𝐴} × tag 𝐵) = (1o Proj ({𝐴} × tag 𝐵)) | |
2 | 1oex 7961 | . . 3 ⊢ 1o ∈ V | |
3 | bj-projval 33932 | . . 3 ⊢ (1o ∈ V → (1o Proj ({𝐴} × tag 𝐵)) = if(𝐴 = 1o, 𝐵, ∅)) | |
4 | 2, 3 | ax-mp 5 | . 2 ⊢ (1o Proj ({𝐴} × tag 𝐵)) = if(𝐴 = 1o, 𝐵, ∅) |
5 | 1, 4 | eqtri 2819 | 1 ⊢ pr2 ({𝐴} × tag 𝐵) = if(𝐴 = 1o, 𝐵, ∅) |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1522 ∈ wcel 2081 Vcvv 3437 ∅c0 4211 ifcif 4381 {csn 4472 × cxp 5441 1oc1o 7946 tag bj-ctag 33910 Proj bj-cproj 33926 pr2 bj-cpr2 33950 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1777 ax-4 1791 ax-5 1888 ax-6 1947 ax-7 1992 ax-8 2083 ax-9 2091 ax-10 2112 ax-11 2126 ax-12 2141 ax-13 2344 ax-ext 2769 ax-sep 5094 ax-nul 5101 ax-pr 5221 ax-un 7319 |
This theorem depends on definitions: df-bi 208 df-an 397 df-or 843 df-3or 1081 df-3an 1082 df-tru 1525 df-ex 1762 df-nf 1766 df-sb 2043 df-mo 2576 df-eu 2612 df-clab 2776 df-cleq 2788 df-clel 2863 df-nfc 2935 df-ne 2985 df-ral 3110 df-rex 3111 df-rab 3114 df-v 3439 df-sbc 3707 df-dif 3862 df-un 3864 df-in 3866 df-ss 3874 df-pss 3876 df-nul 4212 df-if 4382 df-pw 4455 df-sn 4473 df-pr 4475 df-tp 4477 df-op 4479 df-uni 4746 df-br 4963 df-opab 5025 df-tr 5064 df-eprel 5353 df-po 5362 df-so 5363 df-fr 5402 df-we 5404 df-xp 5449 df-rel 5450 df-cnv 5451 df-dm 5453 df-rn 5454 df-res 5455 df-ima 5456 df-ord 6069 df-on 6070 df-suc 6072 df-1o 7953 df-bj-sngl 33902 df-bj-tag 33911 df-bj-proj 33927 df-bj-pr2 33951 |
This theorem is referenced by: bj-pr22val 33955 |
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