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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 5722 | . . 3 ⊢ (𝐴 × {𝐵}) = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 3 | 1, 2 | fnmpti 6678 | . 2 ⊢ (𝐴 × {𝐵}) Fn 𝐴 |
| 4 | rnxpss 6169 | . 2 ⊢ ran (𝐴 × {𝐵}) ⊆ {𝐵} | |
| 5 | df-f 6540 | . 2 ⊢ ((𝐴 × {𝐵}):𝐴⟶{𝐵} ↔ ((𝐴 × {𝐵}) Fn 𝐴 ∧ ran (𝐴 × {𝐵}) ⊆ {𝐵})) | |
| 6 | 3, 4, 5 | mpbir2an 723 | 1 ⊢ (𝐴 × {𝐵}):𝐴⟶{𝐵} |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2142 Vcvv 3454 ⊆ wss 3904 {csn 4588 × cxp 5658 ran crn 5661 Fn wfn 6531 ⟶wf 6532 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-10 2175 ax-11 2191 ax-12 2212 ax-ext 2734 ax-sep 5256 ax-pr 5403 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1104 df-tru 1572 df-fal 1582 df-ex 1809 df-nf 1813 df-sb 2096 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-ral 3079 df-rex 3089 df-rab 3416 df-v 3456 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-nul 4286 df-if 4487 df-sn 4589 df-pr 4591 df-op 4595 df-br 5109 df-opab 5173 df-mpt 5192 df-id 5555 df-xp 5666 df-rel 5667 df-cnv 5668 df-co 5669 df-dm 5670 df-rn 5671 df-fun 6538 df-fn 6539 df-f 6540 |
| This theorem is used by: fconstg 6765 fodomr 9114 fodomfir 9285 ofsubeq0 12221 ser0f 14098 hashgval 14376 hashinf 14378 hashfxnn0 14380 prodf1f 15953 pwssplit1 21191 psrbag0 22224 xkofvcn 23852 rrx0el 25568 ibl0 25957 dvcmul 26114 dvcmulf 26115 dvexp 26123 plymul02 26452 elqaalem3 26493 basellem7 27262 basellem9 27264 noetasuplem4 27911 axlowdimlem8 29310 axlowdimlem9 29311 axlowdimlem10 29312 axlowdimlem11 29313 axlowdimlem12 29314 0oo 31152 occllem 31666 ho01i 32191 nlelchi 32424 hmopidmchi 32514 elrgspnlem1 33571 gsumind 33674 esplyfval0 33963 eulerpartlemt 34770 breprexpnat 35030 fullfunfnv 36446 fullfunfv 36447 poimirlem16 38315 poimirlem19 38318 poimirlem23 38322 poimirlem24 38323 poimirlem25 38324 poimirlem28 38327 poimirlem29 38328 poimirlem30 38329 poimirlem31 38330 poimirlem32 38331 ftc1anclem5 38376 lfl0f 39871 diophrw 43518 pwssplit4 43844 ofsubid 45062 dvsconst 45068 dvsid 45069 binomcxplemnn0 45087 binomcxplemnotnn0 45094 functermc 50314 aacllem 50649 |
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