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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 5712 | . . 3 ⊢ (𝐴 × {𝐵}) = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 3 | 1, 2 | fnmpti 6682 | . 2 ⊢ (𝐴 × {𝐵}) Fn 𝐴 |
| 4 | rnxpss 6163 | . 2 ⊢ ran (𝐴 × {𝐵}) ⊆ {𝐵} | |
| 5 | df-f 6542 | . 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 2144 Vcvv 3450 ⊆ wss 3895 {csn 4583 × cxp 5648 ran crn 5651 Fn wfn 6533 ⟶wf 6534 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 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 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 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-ss 3896 df-dif 4047 df-in 4091 df-un 4151 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 5545 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-fun 6540 df-fn 6541 df-f 6542 |
| This theorem is used by: fconstg 6769 fodomr 9147 fodomfir 9319 ofsubeq0 12317 ser0f 14198 hashgval 14477 hashinf 14479 hashfxnn0 14481 prodf1f 16061 pwssplit1 21334 psrbag0 22371 xkofvcn 24003 rrx0el 25719 ibl0 26107 dvcmul 26264 dvcmulf 26265 dvexp 26273 plymul02 26601 elqaalem3 26644 basellem7 27414 basellem9 27416 noetasuplem4 28093 axlowdimlem8 29527 axlowdimlem9 29528 axlowdimlem10 29529 axlowdimlem11 29530 axlowdimlem12 29531 0oo 31391 occllem 31905 ho01i 32430 nlelchi 32663 hmopidmchi 32753 elrgspnlem1 33845 gsumind 33948 esplyfval0 34238 eulerpartlemt 35045 breprexpnat 35305 fullfunfnv 36752 fullfunfv 36753 poimirlem16 38597 poimirlem19 38600 poimirlem23 38604 poimirlem24 38605 poimirlem25 38606 poimirlem28 38609 poimirlem29 38610 poimirlem30 38611 poimirlem31 38612 poimirlem32 38613 ftc1anclem5 38658 lfl0f 40169 diophrw 43813 pwssplit4 44134 ofsubid 45351 dvsconst 45357 dvsid 45358 binomcxplemnn0 45376 binomcxplemnotnn0 45383 functermc 50659 aacllem 50982 |
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