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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 5709 | . . 3 ⊢ (𝐴 × {𝐵}) = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 3 | 1, 2 | fnmpti 6670 | . 2 ⊢ (𝐴 × {𝐵}) Fn 𝐴 |
| 4 | rnxpss 6159 | . 2 ⊢ ran (𝐴 × {𝐵}) ⊆ {𝐵} | |
| 5 | df-f 6531 | . 2 ⊢ ((𝐴 × {𝐵}):𝐴⟶{𝐵} ↔ ((𝐴 × {𝐵}) Fn 𝐴 ∧ ran (𝐴 × {𝐵}) ⊆ {𝐵})) | |
| 6 | 3, 4, 5 | mpbir2an 724 | 1 ⊢ (𝐴 × {𝐵}):𝐴⟶{𝐵} |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2145 Vcvv 3450 ⊆ wss 3898 {csn 4583 × cxp 5645 ran crn 5648 Fn wfn 6522 ⟶wf 6523 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5248 ax-pr 5390 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-nul 4279 df-if 4482 df-sn 4584 df-pr 4586 df-op 4590 df-br 5103 df-opab 5167 df-mpt 5186 df-id 5542 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-rn 5658 df-fun 6529 df-fn 6530 df-f 6531 |
| This theorem is used by: fconstg 6757 fodomr 9125 fodomfir 9297 ofsubeq0 12286 ser0f 14166 hashgval 14444 hashinf 14446 hashfxnn0 14448 prodf1f 16028 pwssplit1 21295 psrbag0 22332 xkofvcn 23964 rrx0el 25680 ibl0 26068 dvcmul 26225 dvcmulf 26226 dvexp 26234 plymul02 26564 elqaalem3 26607 basellem7 27377 basellem9 27379 noetasuplem4 28026 axlowdimlem8 29460 axlowdimlem9 29461 axlowdimlem10 29462 axlowdimlem11 29463 axlowdimlem12 29464 0oo 31324 occllem 31838 ho01i 32363 nlelchi 32596 hmopidmchi 32686 elrgspnlem1 33736 gsumind 33839 esplyfval0 34129 eulerpartlemt 34937 breprexpnat 35197 fullfunfnv 36632 fullfunfv 36633 poimirlem16 38474 poimirlem19 38477 poimirlem23 38481 poimirlem24 38482 poimirlem25 38483 poimirlem28 38486 poimirlem29 38487 poimirlem30 38488 poimirlem31 38489 poimirlem32 38490 ftc1anclem5 38535 lfl0f 40046 diophrw 43708 pwssplit4 44034 ofsubid 45252 dvsconst 45258 dvsid 45259 binomcxplemnn0 45277 binomcxplemnotnn0 45284 functermc 50538 aacllem 50861 |
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