Mathbox for Alexander van der Vekens |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > Mathboxes > nfunsnafv | Structured version Visualization version GIF version |
Description: If the restriction of a class to a singleton is not a function, its value is the universe, compare with nfunsn 6743. (Contributed by Alexander van der Vekens, 25-May-2017.) |
Ref | Expression |
---|---|
nfunsnafv | ⊢ (¬ Fun (𝐹 ↾ {𝐴}) → (𝐹'''𝐴) = V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-dfat 44237 | . . 3 ⊢ (𝐹 defAt 𝐴 ↔ (𝐴 ∈ dom 𝐹 ∧ Fun (𝐹 ↾ {𝐴}))) | |
2 | 1 | simprbi 500 | . 2 ⊢ (𝐹 defAt 𝐴 → Fun (𝐹 ↾ {𝐴})) |
3 | afvnfundmuv 44257 | . 2 ⊢ (¬ 𝐹 defAt 𝐴 → (𝐹'''𝐴) = V) | |
4 | 2, 3 | nsyl5 162 | 1 ⊢ (¬ Fun (𝐹 ↾ {𝐴}) → (𝐹'''𝐴) = V) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 = wceq 1543 ∈ wcel 2110 Vcvv 3401 {csn 4531 dom cdm 5540 ↾ cres 5542 Fun wfun 6363 defAt wdfat 44234 '''cafv 44235 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2016 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2158 ax-12 2175 ax-ext 2706 ax-sep 5181 ax-nul 5188 ax-pow 5247 ax-pr 5311 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2071 df-mo 2537 df-eu 2566 df-clab 2713 df-cleq 2726 df-clel 2812 df-nfc 2882 df-ne 2936 df-ral 3059 df-rex 3060 df-rab 3063 df-v 3403 df-sbc 3688 df-csb 3803 df-dif 3860 df-un 3862 df-in 3864 df-ss 3874 df-nul 4228 df-if 4430 df-sn 4532 df-pr 4534 df-op 4538 df-uni 4810 df-int 4850 df-br 5044 df-opab 5106 df-id 5444 df-xp 5546 df-rel 5547 df-cnv 5548 df-co 5549 df-dm 5550 df-res 5552 df-iota 6327 df-fun 6371 df-fv 6377 df-aiota 44203 df-dfat 44237 df-afv 44238 |
This theorem is referenced by: afvvfunressn 44261 nfunsnaov 44304 |
Copyright terms: Public domain | W3C validator |