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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 9093 | . 2 ⊢ (𝐴 ≼ ω → ◡𝐴 ≼ ω) | |
| 2 | dmct 10632 | . 2 ⊢ (◡𝐴 ≼ ω → dom ◡𝐴 ≼ ω) | |
| 3 | df-rn 5667 | . . . 4 ⊢ ran 𝐴 = dom ◡𝐴 | |
| 4 | 3 | breq1i 5113 | . . 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 5106 ◡ccnv 5655 dom cdm 5656 ran crn 5657 ωcom 7904 ≼ cdom 9002 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-rep 5236 ax-sep 5253 ax-nul 5264 ax-pow 5332 ax-pr 5396 ax-un 7778 ax-inf2 9672 |
| 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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3081 df-rex 3091 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-int 4911 df-iun 4956 df-br 5107 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5551 df-eprel 5556 df-po 5564 df-so 5565 df-fr 5609 df-se 5610 df-we 5611 df-xp 5662 df-rel 5663 df-cnv 5664 df-co 5665 df-dm 5666 df-rn 5667 df-res 5668 df-ima 5669 df-pred 6325 df-ord 6386 df-on 6387 df-lim 6388 df-suc 6389 df-iota 6515 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-isom 6570 df-riota 7403 df-ov 7449 df-oprab 7450 df-mpo 7451 df-om 7905 df-1st 8028 df-2nd 8029 df-frecs 8330 df-wrecs 8361 df-recs 8410 df-er 8748 df-map 8880 df-en 9005 df-dom 9006 df-card 10050 df-acn 10053 |
| This theorem is used by: abrexctf 33383 sigapildsys 34878 dya2iocct 34995 omssubadd 35015 carsgclctunlem2 35034 pmeasadd 35040 smfpimcc 48033 |
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