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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 9061 fodomfir 9233 ofsubeq0 12147 ser0f 13983 hashgval 14261 hashinf 14263 hashfxnn0 14265 prodf1f 15820 pwssplit1 21016 psrbag0 22022 xkofvcn 23633 rrx0el 25359 ibl0 25749 dvcmul 25908 dvcmulf 25909 dvexp 25918 elqaalem3 26290 basellem7 27058 basellem9 27060 noetasuplem4 27709 axlowdimlem8 29027 axlowdimlem9 29028 axlowdimlem10 29029 axlowdimlem11 29030 axlowdimlem12 29031 0oo 30869 occllem 31383 ho01i 31908 nlelchi 32141 hmopidmchi 32231 elrgspnlem1 33328 gsumind 33430 esplyfval0 33733 eulerpartlemt 34541 plymul02 34716 breprexpnat 34804 fullfunfnv 36153 fullfunfv 36154 poimirlem16 37850 poimirlem19 37853 poimirlem23 37857 poimirlem24 37858 poimirlem25 37859 poimirlem28 37862 poimirlem29 37863 poimirlem30 37864 poimirlem31 37865 poimirlem32 37866 ftc1anclem5 37911 lfl0f 39408 diophrw 43079 pwssplit4 43409 ofsubid 44643 dvsconst 44649 dvsid 44650 binomcxplemnn0 44668 binomcxplemnotnn0 44675 functermc 49830 aacllem 50123 |
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