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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 8905 | . . 3 ⊢ (𝐴 ≼ ω → 𝐴 ∈ V) | |
| 2 | imadomg 10451 | . . . 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 8949 | . 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 3430 class class class wbr 5086 “ cima 5629 Fun wfun 6488 ωcom 7812 ≼ cdom 8886 |
| 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 5213 ax-sep 5232 ax-nul 5242 ax-pow 5304 ax-pr 5372 ax-un 7684 ax-ac2 10380 |
| 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 3343 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-int 4891 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5521 df-eprel 5526 df-po 5534 df-so 5535 df-fr 5579 df-se 5580 df-we 5581 df-xp 5632 df-rel 5633 df-cnv 5634 df-co 5635 df-dm 5636 df-rn 5637 df-res 5638 df-ima 5639 df-pred 6261 df-ord 6322 df-on 6323 df-suc 6325 df-iota 6450 df-fun 6496 df-fn 6497 df-f 6498 df-f1 6499 df-fo 6500 df-f1o 6501 df-fv 6502 df-isom 6503 df-riota 7319 df-ov 7365 df-oprab 7366 df-mpo 7367 df-1st 7937 df-2nd 7938 df-frecs 8226 df-wrecs 8257 df-recs 8306 df-er 8638 df-map 8770 df-en 8889 df-dom 8890 df-card 9858 df-acn 9861 df-ac 10033 |
| This theorem is referenced by: smfpimbor1lem1 47250 |
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