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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 7058 | . 2 ⊢ ((𝐹:𝐴⟶{𝐵} ∧ 𝐶 ∈ 𝐴) → (𝐹‘𝐶) ∈ {𝐵}) | |
| 2 | elsni 4598 | . 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 399 = wceq 1559 ∈ wcel 2141 {csn 4581 ⟶wf 6513 ‘cfv 6517 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-12 2211 ax-ext 2733 ax-sep 5245 ax-nul 5255 ax-pr 5389 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-ne 2957 df-ral 3076 df-rex 3086 df-rab 3414 df-v 3455 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-nul 4286 df-if 4480 df-sn 4582 df-pr 4584 df-op 4588 df-uni 4865 df-br 5100 df-opab 5162 df-id 5540 df-xp 5651 df-rel 5652 df-cnv 5653 df-co 5654 df-dm 5655 df-rn 5656 df-iota 6473 df-fun 6519 df-fn 6520 df-f 6521 df-fv 6525 |
| This theorem is referenced by: fvconst2g 7182 fconst2g 7183 f1cdmsn 7262 nf1const 7284 zrtermorngc 20672 zrtermoringc 20704 ipasslem9 30987 resf1o 32882 elrgspnlem1 33384 ccatmulgnn0dir 34800 prv1n 35745 sticksstones11 42737 |
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