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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 5698 | . . 3 ⊢ (𝐴 × {𝐵}) = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 3 | 1, 2 | fnmpti 6649 | . 2 ⊢ (𝐴 × {𝐵}) Fn 𝐴 |
| 4 | rnxpss 6143 | . 2 ⊢ ran (𝐴 × {𝐵}) ⊆ {𝐵} | |
| 5 | df-f 6510 | . 2 ⊢ ((𝐴 × {𝐵}):𝐴⟶{𝐵} ↔ ((𝐴 × {𝐵}) Fn 𝐴 ∧ ran (𝐴 × {𝐵}) ⊆ {𝐵})) | |
| 6 | 3, 4, 5 | mpbir2an 719 | 1 ⊢ (𝐴 × {𝐵}):𝐴⟶{𝐵} |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2132 Vcvv 3444 ⊆ wss 3895 {csn 4572 × cxp 5634 ran crn 5637 Fn wfn 6501 ⟶wf 6502 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1805 ax-4 1819 ax-5 1920 ax-6 1977 ax-7 2018 ax-8 2134 ax-9 2142 ax-10 2165 ax-11 2181 ax-12 2202 ax-ext 2724 ax-sep 5236 ax-pr 5380 |
| This theorem depends on definitions: df-bi 209 df-an 399 df-or 857 df-3an 1097 df-tru 1553 df-fal 1563 df-ex 1790 df-nf 1794 df-sb 2081 df-mo 2556 df-eu 2586 df-clab 2731 df-cleq 2744 df-clel 2827 df-nfc 2901 df-ne 2948 df-ral 3067 df-rex 3077 df-rab 3405 df-v 3446 df-dif 3898 df-un 3900 df-in 3902 df-ss 3912 df-nul 4277 df-if 4471 df-sn 4573 df-pr 4575 df-op 4579 df-br 5091 df-opab 5153 df-mpt 5172 df-id 5531 df-xp 5642 df-rel 5643 df-cnv 5644 df-co 5645 df-dm 5646 df-rn 5647 df-fun 6508 df-fn 6509 df-f 6510 |
| This theorem is referenced by: fconstg 6736 fodomr 9085 fodomfir 9257 ofsubeq0 12178 ser0f 14054 hashgval 14332 hashinf 14334 hashfxnn0 14336 prodf1f 15894 pwssplit1 21095 psrbag0 22084 xkofvcn 23713 rrx0el 25429 ibl0 25818 dvcmul 25975 dvcmulf 25976 dvexp 25984 elqaalem3 26351 basellem7 27117 basellem9 27119 noetasuplem4 27766 axlowdimlem8 29085 axlowdimlem9 29086 axlowdimlem10 29087 axlowdimlem11 29088 axlowdimlem12 29089 0oo 30927 occllem 31441 ho01i 31966 nlelchi 32199 hmopidmchi 32289 elrgspnlem1 33372 gsumind 33477 esplyfval0 33805 eulerpartlemt 34612 plymul02 34787 breprexpnat 34875 fullfunfnv 36234 fullfunfv 36235 poimirlem16 38073 poimirlem19 38076 poimirlem23 38080 poimirlem24 38081 poimirlem25 38082 poimirlem28 38085 poimirlem29 38086 poimirlem30 38087 poimirlem31 38088 poimirlem32 38089 ftc1anclem5 38134 lfl0f 39631 diophrw 43278 pwssplit4 43604 ofsubid 44838 dvsconst 44844 dvsid 44845 binomcxplemnn0 44863 binomcxplemnotnn0 44870 functermc 50067 aacllem 50360 |
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