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Mirrors > Home > MPE Home > Th. List > fconst | Structured version Visualization version GIF version |
Description: A Cartesian product with a singleton is a constant function. (Contributed by NM, 14-Aug-1999.) (Proof shortened by Andrew Salmon, 17-Sep-2011.) |
Ref | Expression |
---|---|
fconst.1 | ⊢ 𝐵 ∈ V |
Ref | Expression |
---|---|
fconst | ⊢ (𝐴 × {𝐵}):𝐴⟶{𝐵} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fconst.1 | . . 3 ⊢ 𝐵 ∈ V | |
2 | fconstmpt 5085 | . . 3 ⊢ (𝐴 × {𝐵}) = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
3 | 1, 2 | fnmpti 5935 | . 2 ⊢ (𝐴 × {𝐵}) Fn 𝐴 |
4 | rnxpss 5485 | . 2 ⊢ ran (𝐴 × {𝐵}) ⊆ {𝐵} | |
5 | df-f 5808 | . 2 ⊢ ((𝐴 × {𝐵}):𝐴⟶{𝐵} ↔ ((𝐴 × {𝐵}) Fn 𝐴 ∧ ran (𝐴 × {𝐵}) ⊆ {𝐵})) | |
6 | 3, 4, 5 | mpbir2an 957 | 1 ⊢ (𝐴 × {𝐵}):𝐴⟶{𝐵} |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 1977 Vcvv 3173 ⊆ wss 3540 {csn 4125 × cxp 5036 ran crn 5039 Fn wfn 5799 ⟶wf 5800 |
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-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 |
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-ral 2901 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-br 4584 df-opab 4644 df-mpt 4645 df-id 4953 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-fun 5806 df-fn 5807 df-f 5808 |
This theorem is referenced by: fconstg 6005 fodomr 7996 ofsubeq0 10894 ser0f 12716 hashgval 12982 hashinf 12984 hashfxnn0 12986 hashfOLD 12988 prodf1f 14463 pwssplit1 18880 psrbag0 19315 xkofvcn 21297 ibl0 23359 dvcmul 23513 dvcmulf 23514 dvexp 23522 elqaalem3 23880 basellem7 24613 basellem9 24615 axlowdimlem8 25629 axlowdimlem9 25630 axlowdimlem10 25631 axlowdimlem11 25632 axlowdimlem12 25633 0oo 27028 occllem 27546 ho01i 28071 nlelchi 28304 hmopidmchi 28394 eulerpartlemt 29760 plymul02 29949 fullfunfnv 31223 fullfunfv 31224 poimirlem16 32595 poimirlem19 32598 poimirlem23 32602 poimirlem24 32603 poimirlem25 32604 poimirlem28 32607 poimirlem29 32608 poimirlem30 32609 poimirlem31 32610 poimirlem32 32611 ftc1anclem5 32659 lfl0f 33374 diophrw 36340 pwssplit4 36677 ofsubid 37545 dvsconst 37551 dvsid 37552 binomcxplemnn0 37570 binomcxplemnotnn0 37577 aacllem 42356 |
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