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| Mirrors > Home > MPE Home > Th. List > Mathboxes > mptctf | Structured version Visualization version GIF version | ||
| Description: A countable mapping set is countable, using bound-variable hypotheses instead of distinct variable conditions. (Contributed by Thierry Arnoux, 8-Mar-2017.) |
| Ref | Expression |
|---|---|
| mptctf.1 | ⊢ Ⅎ𝑥𝐴 |
| Ref | Expression |
|---|---|
| mptctf | ⊢ (𝐴 ≼ ω → (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ ω) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | funmpt 6538 | . 2 ⊢ Fun (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 2 | ctex 8912 | . . . 4 ⊢ (𝐴 ≼ ω → 𝐴 ∈ V) | |
| 3 | eqid 2729 | . . . . . 6 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 4 | 3 | dmmpt 6201 | . . . . 5 ⊢ dom (𝑥 ∈ 𝐴 ↦ 𝐵) = {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ V} |
| 5 | df-rab 3403 | . . . . . 6 ⊢ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ V} = {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝐵 ∈ V)} | |
| 6 | simpl 482 | . . . . . . . 8 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝐵 ∈ V) → 𝑥 ∈ 𝐴) | |
| 7 | 6 | ss2abi 4027 | . . . . . . 7 ⊢ {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝐵 ∈ V)} ⊆ {𝑥 ∣ 𝑥 ∈ 𝐴} |
| 8 | mptctf.1 | . . . . . . . 8 ⊢ Ⅎ𝑥𝐴 | |
| 9 | 8 | abid2f 2922 | . . . . . . 7 ⊢ {𝑥 ∣ 𝑥 ∈ 𝐴} = 𝐴 |
| 10 | 7, 9 | sseqtri 3992 | . . . . . 6 ⊢ {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝐵 ∈ V)} ⊆ 𝐴 |
| 11 | 5, 10 | eqsstri 3990 | . . . . 5 ⊢ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ V} ⊆ 𝐴 |
| 12 | 4, 11 | eqsstri 3990 | . . . 4 ⊢ dom (𝑥 ∈ 𝐴 ↦ 𝐵) ⊆ 𝐴 |
| 13 | ssdomg 8948 | . . . 4 ⊢ (𝐴 ∈ V → (dom (𝑥 ∈ 𝐴 ↦ 𝐵) ⊆ 𝐴 → dom (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ 𝐴)) | |
| 14 | 2, 12, 13 | mpisyl 21 | . . 3 ⊢ (𝐴 ≼ ω → dom (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ 𝐴) |
| 15 | domtr 8955 | . . 3 ⊢ ((dom (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ 𝐴 ∧ 𝐴 ≼ ω) → dom (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ ω) | |
| 16 | 14, 15 | mpancom 688 | . 2 ⊢ (𝐴 ≼ ω → dom (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ ω) |
| 17 | funfn 6530 | . . 3 ⊢ (Fun (𝑥 ∈ 𝐴 ↦ 𝐵) ↔ (𝑥 ∈ 𝐴 ↦ 𝐵) Fn dom (𝑥 ∈ 𝐴 ↦ 𝐵)) | |
| 18 | fnct 10466 | . . 3 ⊢ (((𝑥 ∈ 𝐴 ↦ 𝐵) Fn dom (𝑥 ∈ 𝐴 ↦ 𝐵) ∧ dom (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ ω) → (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ ω) | |
| 19 | 17, 18 | sylanb 581 | . 2 ⊢ ((Fun (𝑥 ∈ 𝐴 ↦ 𝐵) ∧ dom (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ ω) → (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ ω) |
| 20 | 1, 16, 19 | sylancr 587 | 1 ⊢ (𝐴 ≼ ω → (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ ω) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2109 {cab 2707 Ⅎwnfc 2876 {crab 3402 Vcvv 3444 ⊆ wss 3911 class class class wbr 5102 ↦ cmpt 5183 dom cdm 5631 Fun wfun 6493 Fn wfn 6494 ωcom 7822 ≼ cdom 8893 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-rep 5229 ax-sep 5246 ax-nul 5256 ax-pow 5315 ax-pr 5382 ax-un 7691 ax-inf2 9570 ax-ac2 10392 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-ral 3045 df-rex 3054 df-rmo 3351 df-reu 3352 df-rab 3403 df-v 3446 df-sbc 3751 df-csb 3860 df-dif 3914 df-un 3916 df-in 3918 df-ss 3928 df-pss 3931 df-nul 4293 df-if 4485 df-pw 4561 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4868 df-int 4907 df-iun 4953 df-br 5103 df-opab 5165 df-mpt 5184 df-tr 5210 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-se 5585 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6262 df-ord 6323 df-on 6324 df-lim 6325 df-suc 6326 df-iota 6452 df-fun 6501 df-fn 6502 df-f 6503 df-f1 6504 df-fo 6505 df-f1o 6506 df-fv 6507 df-isom 6508 df-riota 7326 df-ov 7372 df-oprab 7373 df-mpo 7374 df-om 7823 df-1st 7947 df-2nd 7948 df-frecs 8237 df-wrecs 8268 df-recs 8317 df-rdg 8355 df-1o 8411 df-er 8648 df-map 8778 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 df-oi 9439 df-card 9868 df-acn 9871 df-ac 10045 |
| This theorem is referenced by: abrexctf 32692 |
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