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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 9063 | . 2 ⊢ (𝐴 ≼ ω → ◡𝐴 ≼ ω) | |
2 | dmct 10553 | . 2 ⊢ (◡𝐴 ≼ ω → dom ◡𝐴 ≼ ω) | |
3 | df-rn 5691 | . . . 4 ⊢ ran 𝐴 = dom ◡𝐴 | |
4 | 3 | breq1i 5157 | . . 3 ⊢ (ran 𝐴 ≼ ω ↔ dom ◡𝐴 ≼ ω) |
5 | 4 | biimpri 227 | . 2 ⊢ (dom ◡𝐴 ≼ ω → ran 𝐴 ≼ ω) |
6 | 1, 2, 5 | 3syl 18 | 1 ⊢ (𝐴 ≼ ω → ran 𝐴 ≼ ω) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 class class class wbr 5150 ◡ccnv 5679 dom cdm 5680 ran crn 5681 ωcom 7874 ≼ cdom 8966 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2698 ax-rep 5287 ax-sep 5301 ax-nul 5308 ax-pow 5367 ax-pr 5431 ax-un 7744 ax-ac2 10492 |
This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2529 df-eu 2558 df-clab 2705 df-cleq 2719 df-clel 2805 df-nfc 2880 df-ne 2937 df-ral 3058 df-rex 3067 df-rmo 3372 df-reu 3373 df-rab 3429 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4325 df-if 4531 df-pw 4606 df-sn 4631 df-pr 4633 df-op 4637 df-uni 4911 df-int 4952 df-iun 5000 df-br 5151 df-opab 5213 df-mpt 5234 df-tr 5268 df-id 5578 df-eprel 5584 df-po 5592 df-so 5593 df-fr 5635 df-se 5636 df-we 5637 df-xp 5686 df-rel 5687 df-cnv 5688 df-co 5689 df-dm 5690 df-rn 5691 df-res 5692 df-ima 5693 df-pred 6308 df-ord 6375 df-on 6376 df-suc 6378 df-iota 6503 df-fun 6553 df-fn 6554 df-f 6555 df-f1 6556 df-fo 6557 df-f1o 6558 df-fv 6559 df-isom 6560 df-riota 7380 df-ov 7427 df-oprab 7428 df-mpo 7429 df-1st 7997 df-2nd 7998 df-frecs 8291 df-wrecs 8322 df-recs 8396 df-er 8729 df-map 8851 df-en 8969 df-dom 8970 df-card 9968 df-acn 9971 df-ac 10145 |
This theorem is referenced by: abrexctf 32518 sigapildsys 33786 dya2iocct 33905 omssubadd 33925 carsgclctunlem2 33944 pmeasadd 33950 smfpimcc 46198 |
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