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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 5687 | . . 3 ⊢ (𝐴 × {𝐵}) = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 3 | 1, 2 | fnmpti 6636 | . 2 ⊢ (𝐴 × {𝐵}) Fn 𝐴 |
| 4 | rnxpss 6131 | . 2 ⊢ ran (𝐴 × {𝐵}) ⊆ {𝐵} | |
| 5 | df-f 6497 | . 2 ⊢ ((𝐴 × {𝐵}):𝐴⟶{𝐵} ↔ ((𝐴 × {𝐵}) Fn 𝐴 ∧ ran (𝐴 × {𝐵}) ⊆ {𝐵})) | |
| 6 | 3, 4, 5 | mpbir2an 712 | 1 ⊢ (𝐴 × {𝐵}):𝐴⟶{𝐵} |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2114 Vcvv 3441 ⊆ wss 3902 {csn 4581 × cxp 5623 ran crn 5626 Fn wfn 6488 ⟶wf 6489 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5242 ax-nul 5252 ax-pr 5378 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3062 df-rab 3401 df-v 3443 df-dif 3905 df-un 3907 df-ss 3919 df-nul 4287 df-if 4481 df-sn 4582 df-pr 4584 df-op 4588 df-br 5100 df-opab 5162 df-mpt 5181 df-id 5520 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-fun 6495 df-fn 6496 df-f 6497 |
| This theorem is referenced by: fconstg 6722 fodomr 9060 fodomfir 9232 ofsubeq0 12146 ser0f 13982 hashgval 14260 hashinf 14262 hashfxnn0 14264 prodf1f 15819 pwssplit1 21015 psrbag0 22021 xkofvcn 23632 rrx0el 25358 ibl0 25748 dvcmul 25907 dvcmulf 25908 dvexp 25917 elqaalem3 26289 basellem7 27057 basellem9 27059 noetasuplem4 27708 axlowdimlem8 29005 axlowdimlem9 29006 axlowdimlem10 29007 axlowdimlem11 29008 axlowdimlem12 29009 0oo 30847 occllem 31361 ho01i 31886 nlelchi 32119 hmopidmchi 32209 elrgspnlem1 33305 gsumind 33407 esplyfval0 33703 eulerpartlemt 34509 plymul02 34684 breprexpnat 34772 fullfunfnv 36121 fullfunfv 36122 poimirlem16 37808 poimirlem19 37811 poimirlem23 37815 poimirlem24 37816 poimirlem25 37817 poimirlem28 37820 poimirlem29 37821 poimirlem30 37822 poimirlem31 37823 poimirlem32 37824 ftc1anclem5 37869 lfl0f 39366 diophrw 43037 pwssplit4 43367 ofsubid 44601 dvsconst 44607 dvsid 44608 binomcxplemnn0 44626 binomcxplemnotnn0 44633 functermc 49789 aacllem 50082 |
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