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| Mirrors > Home > MPE Home > Th. List > rnct | Structured version Visualization version GIF version | ||
| Description: The range of a countable set is countable. (Contributed by Thierry Arnoux, 29-Dec-2016.) |
| Ref | Expression |
|---|---|
| rnct | ⊢ (𝐴 ≼ ω → ran 𝐴 ≼ ω) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cnvct 9046 | . 2 ⊢ (𝐴 ≼ ω → ◡𝐴 ≼ ω) | |
| 2 | dmct 10583 | . 2 ⊢ (◡𝐴 ≼ ω → dom ◡𝐴 ≼ ω) | |
| 3 | df-rn 5662 | . . . 4 ⊢ ran 𝐴 = dom ◡𝐴 | |
| 4 | 3 | breq1i 5110 | . . 3 ⊢ (ran 𝐴 ≼ ω ↔ dom ◡𝐴 ≼ ω) |
| 5 | 4 | biimpri 231 | . 2 ⊢ (dom ◡𝐴 ≼ ω → ran 𝐴 ≼ ω) |
| 6 | 1, 2, 5 | 3syl 19 | 1 ⊢ (𝐴 ≼ ω → ran 𝐴 ≼ ω) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 class class class wbr 5103 ◡ccnv 5650 dom cdm 5651 ran crn 5652 ωcom 7866 ≼ cdom 8955 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-rep 5232 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7740 ax-inf2 9626 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-ral 3078 df-rex 3088 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-int 4908 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-se 5605 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6297 df-ord 6358 df-on 6359 df-lim 6360 df-suc 6361 df-iota 6487 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-isom 6540 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7867 df-1st 7990 df-2nd 7991 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-er 8701 df-map 8833 df-en 8958 df-dom 8959 df-card 10001 df-acn 10004 |
| This theorem is used by: abrexctf 33291 sigapildsys 34777 dya2iocct 34895 omssubadd 34915 carsgclctunlem2 34934 pmeasadd 34940 smfpimcc 47762 |
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