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Mirrors > Home > MPE Home > Th. List > fisuppfi | Structured version Visualization version GIF version |
Description: A function on a finite set is finitely supported. (Contributed by Mario Carneiro, 20-Jun-2015.) |
Ref | Expression |
---|---|
fisuppfi.1 | ⊢ (𝜑 → 𝐴 ∈ Fin) |
fisuppfi.2 | ⊢ (𝜑 → 𝐹:𝐴⟶𝐵) |
Ref | Expression |
---|---|
fisuppfi | ⊢ (𝜑 → (◡𝐹 “ 𝐶) ∈ Fin) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fisuppfi.1 | . 2 ⊢ (𝜑 → 𝐴 ∈ Fin) | |
2 | cnvimass 5625 | . . 3 ⊢ (◡𝐹 “ 𝐶) ⊆ dom 𝐹 | |
3 | fisuppfi.2 | . . . 4 ⊢ (𝜑 → 𝐹:𝐴⟶𝐵) | |
4 | fdm 6190 | . . . 4 ⊢ (𝐹:𝐴⟶𝐵 → dom 𝐹 = 𝐴) | |
5 | 3, 4 | syl 17 | . . 3 ⊢ (𝜑 → dom 𝐹 = 𝐴) |
6 | 2, 5 | syl5sseq 3799 | . 2 ⊢ (𝜑 → (◡𝐹 “ 𝐶) ⊆ 𝐴) |
7 | ssfi 8334 | . 2 ⊢ ((𝐴 ∈ Fin ∧ (◡𝐹 “ 𝐶) ⊆ 𝐴) → (◡𝐹 “ 𝐶) ∈ Fin) | |
8 | 1, 6, 7 | syl2anc 693 | 1 ⊢ (𝜑 → (◡𝐹 “ 𝐶) ∈ Fin) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1629 ∈ wcel 2143 ⊆ wss 3720 ◡ccnv 5247 dom cdm 5248 “ cima 5251 ⟶wf 6026 Fincfn 8107 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1868 ax-4 1883 ax-5 1989 ax-6 2055 ax-7 2091 ax-8 2145 ax-9 2152 ax-10 2172 ax-11 2188 ax-12 2201 ax-13 2406 ax-ext 2749 ax-sep 4911 ax-nul 4919 ax-pow 4970 ax-pr 5033 ax-un 7094 |
This theorem depends on definitions: df-bi 197 df-or 384 df-an 385 df-3or 1070 df-3an 1071 df-tru 1632 df-ex 1851 df-nf 1856 df-sb 2048 df-eu 2620 df-mo 2621 df-clab 2756 df-cleq 2762 df-clel 2765 df-nfc 2900 df-ne 2942 df-ral 3064 df-rex 3065 df-rab 3068 df-v 3350 df-sbc 3585 df-dif 3723 df-un 3725 df-in 3727 df-ss 3734 df-pss 3736 df-nul 4061 df-if 4223 df-pw 4296 df-sn 4314 df-pr 4316 df-tp 4318 df-op 4320 df-uni 4572 df-br 4784 df-opab 4844 df-tr 4884 df-id 5156 df-eprel 5161 df-po 5169 df-so 5170 df-fr 5207 df-we 5209 df-xp 5254 df-rel 5255 df-cnv 5256 df-co 5257 df-dm 5258 df-rn 5259 df-res 5260 df-ima 5261 df-ord 5868 df-on 5869 df-lim 5870 df-suc 5871 df-fun 6032 df-fn 6033 df-f 6034 df-f1 6035 df-fo 6036 df-f1o 6037 df-om 7211 df-er 7894 df-en 8108 df-fin 8111 |
This theorem is referenced by: fdmfisuppfi 8438 fsumss 14667 fprodss 14889 fidmfisupp 39910 |
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