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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 5721 | . . 3 ⊢ (𝐴 × {𝐵}) = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 3 | 1, 2 | fnmpti 6679 | . 2 ⊢ (𝐴 × {𝐵}) Fn 𝐴 |
| 4 | rnxpss 6169 | . 2 ⊢ ran (𝐴 × {𝐵}) ⊆ {𝐵} | |
| 5 | df-f 6541 | . 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 3453 ⊆ wss 3902 {csn 4587 × cxp 5657 ran crn 5660 Fn wfn 6532 ⟶wf 6533 |
| 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 2215 ax-ext 2734 ax-sep 5255 ax-pr 5402 |
| 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 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-ral 3079 df-rex 3089 df-rab 3415 df-v 3455 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4283 df-if 4486 df-sn 4588 df-pr 4590 df-op 4594 df-br 5108 df-opab 5172 df-mpt 5191 df-id 5554 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-fun 6539 df-fn 6540 df-f 6541 |
| This theorem is used by: fconstg 6766 fodomr 9129 fodomfir 9300 ofsubeq0 12242 ser0f 14121 hashgval 14399 hashinf 14401 hashfxnn0 14403 prodf1f 15983 pwssplit1 21244 psrbag0 22279 xkofvcn 23911 rrx0el 25627 ibl0 26016 dvcmul 26173 dvcmulf 26174 dvexp 26182 plymul02 26511 elqaalem3 26552 basellem7 27321 basellem9 27323 noetasuplem4 27970 axlowdimlem8 29392 axlowdimlem9 29393 axlowdimlem10 29394 axlowdimlem11 29395 axlowdimlem12 29396 0oo 31256 occllem 31770 ho01i 32295 nlelchi 32528 hmopidmchi 32618 elrgspnlem1 33669 gsumind 33772 esplyfval0 34061 eulerpartlemt 34869 breprexpnat 35129 fullfunfnv 36512 fullfunfv 36513 poimirlem16 38372 poimirlem19 38375 poimirlem23 38379 poimirlem24 38380 poimirlem25 38381 poimirlem28 38384 poimirlem29 38385 poimirlem30 38386 poimirlem31 38387 poimirlem32 38388 ftc1anclem5 38433 lfl0f 39929 diophrw 43591 pwssplit4 43917 ofsubid 45135 dvsconst 45141 dvsid 45142 binomcxplemnn0 45160 binomcxplemnotnn0 45167 functermc 50421 aacllem 50759 |
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