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| Mirrors > Home > MPE Home > Th. List > fimact | Structured version Visualization version GIF version | ||
| Description: The image by a function of a countable set is countable. (Contributed by Thierry Arnoux, 27-Mar-2018.) |
| Ref | Expression |
|---|---|
| fimact | ⊢ ((𝐴 ≼ ω ∧ Fun 𝐹) → (𝐹 “ 𝐴) ≼ ω) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ctex 8914 | . . 3 ⊢ (𝐴 ≼ ω → 𝐴 ∈ V) | |
| 2 | imadomg 10458 | . . . 4 ⊢ (𝐴 ∈ V → (Fun 𝐹 → (𝐹 “ 𝐴) ≼ 𝐴)) | |
| 3 | 2 | imp 406 | . . 3 ⊢ ((𝐴 ∈ V ∧ Fun 𝐹) → (𝐹 “ 𝐴) ≼ 𝐴) |
| 4 | 1, 3 | sylan 581 | . 2 ⊢ ((𝐴 ≼ ω ∧ Fun 𝐹) → (𝐹 “ 𝐴) ≼ 𝐴) |
| 5 | simpl 482 | . 2 ⊢ ((𝐴 ≼ ω ∧ Fun 𝐹) → 𝐴 ≼ ω) | |
| 6 | domtr 8958 | . 2 ⊢ (((𝐹 “ 𝐴) ≼ 𝐴 ∧ 𝐴 ≼ ω) → (𝐹 “ 𝐴) ≼ ω) | |
| 7 | 4, 5, 6 | syl2anc 585 | 1 ⊢ ((𝐴 ≼ ω ∧ Fun 𝐹) → (𝐹 “ 𝐴) ≼ ω) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2114 Vcvv 3442 class class class wbr 5100 “ cima 5637 Fun wfun 6496 ωcom 7820 ≼ cdom 8895 |
| 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-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5245 ax-nul 5255 ax-pow 5314 ax-pr 5381 ax-un 7692 ax-ac2 10387 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 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-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-rmo 3352 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-int 4905 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5529 df-eprel 5534 df-po 5542 df-so 5543 df-fr 5587 df-se 5588 df-we 5589 df-xp 5640 df-rel 5641 df-cnv 5642 df-co 5643 df-dm 5644 df-rn 5645 df-res 5646 df-ima 5647 df-pred 6269 df-ord 6330 df-on 6331 df-suc 6333 df-iota 6458 df-fun 6504 df-fn 6505 df-f 6506 df-f1 6507 df-fo 6508 df-f1o 6509 df-fv 6510 df-isom 6511 df-riota 7327 df-ov 7373 df-oprab 7374 df-mpo 7375 df-1st 7945 df-2nd 7946 df-frecs 8235 df-wrecs 8266 df-recs 8315 df-er 8647 df-map 8779 df-en 8898 df-dom 8899 df-card 9865 df-acn 9868 df-ac 10040 |
| This theorem is referenced by: smfpimbor1lem1 47185 |
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