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| Mirrors > Home > MPE Home > Th. List > Mathboxes > afvnufveq | Structured version Visualization version GIF version | ||
| Description: The value of the alternative function at a set as argument equals the function's value at this argument. (Contributed by Alexander van der Vekens, 25-May-2017.) |
| Ref | Expression |
|---|---|
| afvnufveq | ⊢ ((𝐹'''𝐴) ≠ V → (𝐹'''𝐴) = (𝐹‘𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | afvfundmfveq 47252 | . . 3 ⊢ (𝐹 defAt 𝐴 → (𝐹'''𝐴) = (𝐹‘𝐴)) | |
| 2 | afvnfundmuv 47253 | . . 3 ⊢ (¬ 𝐹 defAt 𝐴 → (𝐹'''𝐴) = V) | |
| 3 | 1, 2 | nsyl5 159 | . 2 ⊢ (¬ (𝐹'''𝐴) = (𝐹‘𝐴) → (𝐹'''𝐴) = V) |
| 4 | 3 | necon1ai 2957 | 1 ⊢ ((𝐹'''𝐴) ≠ V → (𝐹'''𝐴) = (𝐹‘𝐴)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1541 ≠ wne 2930 Vcvv 3438 ‘cfv 6489 defAt wdfat 47230 '''cafv 47231 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2705 ax-sep 5238 ax-nul 5248 ax-pr 5374 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2725 df-clel 2808 df-nfc 2883 df-ne 2931 df-ral 3050 df-rex 3059 df-rab 3398 df-v 3440 df-sbc 3739 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4285 df-if 4477 df-sn 4578 df-pr 4580 df-op 4584 df-uni 4861 df-int 4900 df-br 5096 df-opab 5158 df-id 5516 df-xp 5627 df-rel 5628 df-cnv 5629 df-co 5630 df-dm 5631 df-res 5633 df-iota 6445 df-fun 6491 df-fv 6497 df-aiota 47199 df-dfat 47233 df-afv 47234 |
| This theorem is referenced by: afvvfveq 47262 afvfv0bi 47266 aovnuoveq 47305 |
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