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Mirrors > Home > MPE Home > Th. List > prod2id | Structured version Visualization version GIF version |
Description: The second class argument to a product can be chosen so that it is always a set. (Contributed by Scott Fenton, 4-Dec-2017.) |
Ref | Expression |
---|---|
prod2id | ⊢ ∏𝑘 ∈ 𝐴 𝐵 = ∏𝑘 ∈ 𝐴 ( I ‘𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | prodeq2ii 15551 | . 2 ⊢ (∀𝑘 ∈ 𝐴 ( I ‘𝐵) = ( I ‘( I ‘𝐵)) → ∏𝑘 ∈ 𝐴 𝐵 = ∏𝑘 ∈ 𝐴 ( I ‘𝐵)) | |
2 | fvex 6769 | . . . . 5 ⊢ ( I ‘𝐵) ∈ V | |
3 | fvi 6826 | . . . . 5 ⊢ (( I ‘𝐵) ∈ V → ( I ‘( I ‘𝐵)) = ( I ‘𝐵)) | |
4 | 2, 3 | ax-mp 5 | . . . 4 ⊢ ( I ‘( I ‘𝐵)) = ( I ‘𝐵) |
5 | 4 | eqcomi 2747 | . . 3 ⊢ ( I ‘𝐵) = ( I ‘( I ‘𝐵)) |
6 | 5 | a1i 11 | . 2 ⊢ (𝑘 ∈ 𝐴 → ( I ‘𝐵) = ( I ‘( I ‘𝐵))) |
7 | 1, 6 | mprg 3077 | 1 ⊢ ∏𝑘 ∈ 𝐴 𝐵 = ∏𝑘 ∈ 𝐴 ( I ‘𝐵) |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1539 ∈ wcel 2108 Vcvv 3422 I cid 5479 ‘cfv 6418 ∏cprod 15543 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-1st 7804 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-nn 11904 df-n0 12164 df-z 12250 df-uz 12512 df-fz 13169 df-seq 13650 df-prod 15544 |
This theorem is referenced by: prodfc 15583 |
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