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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 5684 | . . 3 ⊢ (𝐴 × {𝐵}) = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 3 | 1, 2 | fnmpti 6633 | . 2 ⊢ (𝐴 × {𝐵}) Fn 𝐴 |
| 4 | rnxpss 6128 | . 2 ⊢ ran (𝐴 × {𝐵}) ⊆ {𝐵} | |
| 5 | df-f 6494 | . 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 3430 ⊆ wss 3890 {csn 4568 × cxp 5620 ran crn 5623 Fn wfn 6485 ⟶wf 6486 |
| 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 5231 ax-pr 5368 |
| 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 3063 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-sn 4569 df-pr 4571 df-op 4575 df-br 5087 df-opab 5149 df-mpt 5168 df-id 5517 df-xp 5628 df-rel 5629 df-cnv 5630 df-co 5631 df-dm 5632 df-rn 5633 df-fun 6492 df-fn 6493 df-f 6494 |
| This theorem is referenced by: fconstg 6719 fodomr 9057 fodomfir 9229 ofsubeq0 12143 ser0f 13979 hashgval 14257 hashinf 14259 hashfxnn0 14261 prodf1f 15816 pwssplit1 21013 psrbag0 22018 xkofvcn 23627 rrx0el 25343 ibl0 25732 dvcmul 25889 dvcmulf 25890 dvexp 25898 elqaalem3 26269 basellem7 27037 basellem9 27039 noetasuplem4 27688 axlowdimlem8 29006 axlowdimlem9 29007 axlowdimlem10 29008 axlowdimlem11 29009 axlowdimlem12 29010 0oo 30849 occllem 31363 ho01i 31888 nlelchi 32121 hmopidmchi 32211 elrgspnlem1 33308 gsumind 33410 esplyfval0 33713 eulerpartlemt 34521 plymul02 34696 breprexpnat 34784 fullfunfnv 36134 fullfunfv 36135 poimirlem16 37948 poimirlem19 37951 poimirlem23 37955 poimirlem24 37956 poimirlem25 37957 poimirlem28 37960 poimirlem29 37961 poimirlem30 37962 poimirlem31 37963 poimirlem32 37964 ftc1anclem5 38009 lfl0f 39506 diophrw 43190 pwssplit4 43520 ofsubid 44754 dvsconst 44760 dvsid 44761 binomcxplemnn0 44779 binomcxplemnotnn0 44786 functermc 49941 aacllem 50234 |
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