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| Mirrors > Home > MPE Home > Th. List > fvconst | Structured version Visualization version GIF version | ||
| Description: The value of a constant function. (Contributed by NM, 30-May-1999.) |
| Ref | Expression |
|---|---|
| fvconst | ⊢ ((𝐹:𝐴⟶{𝐵} ∧ 𝐶 ∈ 𝐴) → (𝐹‘𝐶) = 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ffvelcdm 7035 | . 2 ⊢ ((𝐹:𝐴⟶{𝐵} ∧ 𝐶 ∈ 𝐴) → (𝐹‘𝐶) ∈ {𝐵}) | |
| 2 | elsni 4599 | . 2 ⊢ ((𝐹‘𝐶) ∈ {𝐵} → (𝐹‘𝐶) = 𝐵) | |
| 3 | 1, 2 | syl 17 | 1 ⊢ ((𝐹:𝐴⟶{𝐵} ∧ 𝐶 ∈ 𝐴) → (𝐹‘𝐶) = 𝐵) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1542 ∈ wcel 2114 {csn 4582 ⟶wf 6496 ‘cfv 6500 |
| 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-12 2185 ax-ext 2709 ax-sep 5243 ax-nul 5253 ax-pr 5379 |
| 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-ne 2934 df-ral 3053 df-rex 3063 df-rab 3402 df-v 3444 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-br 5101 df-opab 5163 df-id 5527 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-fv 6508 |
| This theorem is referenced by: fvconst2g 7158 fconst2g 7159 f1cdmsn 7238 nf1const 7260 zrtermorngc 20588 zrtermoringc 20620 ipasslem9 30925 resf1o 32819 elrgspnlem1 33335 ccatmulgnn0dir 34719 prv1n 35644 sticksstones11 42520 |
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