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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 6525 | . 2 ⊢ Fun (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 2 | ctex 8899 | . . . 4 ⊢ (𝐴 ≼ ω → 𝐴 ∈ V) | |
| 3 | eqid 2735 | . . . . . 6 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 4 | 3 | dmmpt 6193 | . . . . 5 ⊢ dom (𝑥 ∈ 𝐴 ↦ 𝐵) = {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ V} |
| 5 | df-rab 3388 | . . . . . 6 ⊢ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ V} = {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝐵 ∈ V)} | |
| 6 | simpl 482 | . . . . . . . 8 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝐵 ∈ V) → 𝑥 ∈ 𝐴) | |
| 7 | 6 | ss2abi 3999 | . . . . . . 7 ⊢ {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝐵 ∈ V)} ⊆ {𝑥 ∣ 𝑥 ∈ 𝐴} |
| 8 | mptctf.1 | . . . . . . . 8 ⊢ Ⅎ𝑥𝐴 | |
| 9 | 8 | abid2f 2927 | . . . . . . 7 ⊢ {𝑥 ∣ 𝑥 ∈ 𝐴} = 𝐴 |
| 10 | 7, 9 | sseqtri 3965 | . . . . . 6 ⊢ {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝐵 ∈ V)} ⊆ 𝐴 |
| 11 | 5, 10 | eqsstri 3963 | . . . . 5 ⊢ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ V} ⊆ 𝐴 |
| 12 | 4, 11 | eqsstri 3963 | . . . 4 ⊢ dom (𝑥 ∈ 𝐴 ↦ 𝐵) ⊆ 𝐴 |
| 13 | ssdomg 8936 | . . . 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 8943 | . . 3 ⊢ ((dom (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ 𝐴 ∧ 𝐴 ≼ ω) → dom (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ ω) | |
| 16 | 14, 15 | mpancom 689 | . 2 ⊢ (𝐴 ≼ ω → dom (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ ω) |
| 17 | funfn 6517 | . . 3 ⊢ (Fun (𝑥 ∈ 𝐴 ↦ 𝐵) ↔ (𝑥 ∈ 𝐴 ↦ 𝐵) Fn dom (𝑥 ∈ 𝐴 ↦ 𝐵)) | |
| 18 | fnct 10448 | . . 3 ⊢ (((𝑥 ∈ 𝐴 ↦ 𝐵) Fn dom (𝑥 ∈ 𝐴 ↦ 𝐵) ∧ dom (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ ω) → (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ ω) | |
| 19 | 17, 18 | sylanb 582 | . 2 ⊢ ((Fun (𝑥 ∈ 𝐴 ↦ 𝐵) ∧ dom (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ ω) → (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ ω) |
| 20 | 1, 16, 19 | sylancr 588 | 1 ⊢ (𝐴 ≼ ω → (𝑥 ∈ 𝐴 ↦ 𝐵) ≼ ω) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2114 {cab 2713 Ⅎwnfc 2882 {crab 3387 Vcvv 3427 ⊆ wss 3885 class class class wbr 5074 ↦ cmpt 5155 dom cdm 5620 Fun wfun 6481 Fn wfn 6482 ωcom 7806 ≼ cdom 8880 |
| 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 2184 ax-ext 2707 ax-rep 5201 ax-sep 5220 ax-nul 5230 ax-pow 5296 ax-pr 5364 ax-un 7678 ax-inf2 9551 ax-ac2 10374 |
| 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 2538 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2810 df-nfc 2884 df-ne 2931 df-ral 3050 df-rex 3060 df-rmo 3340 df-reu 3341 df-rab 3388 df-v 3429 df-sbc 3726 df-csb 3834 df-dif 3888 df-un 3890 df-in 3892 df-ss 3902 df-pss 3905 df-nul 4264 df-if 4457 df-pw 4533 df-sn 4558 df-pr 4560 df-op 4564 df-uni 4841 df-int 4880 df-iun 4925 df-br 5075 df-opab 5137 df-mpt 5156 df-tr 5182 df-id 5515 df-eprel 5520 df-po 5528 df-so 5529 df-fr 5573 df-se 5574 df-we 5575 df-xp 5626 df-rel 5627 df-cnv 5628 df-co 5629 df-dm 5630 df-rn 5631 df-res 5632 df-ima 5633 df-pred 6254 df-ord 6315 df-on 6316 df-lim 6317 df-suc 6318 df-iota 6443 df-fun 6489 df-fn 6490 df-f 6491 df-f1 6492 df-fo 6493 df-f1o 6494 df-fv 6495 df-isom 6496 df-riota 7313 df-ov 7359 df-oprab 7360 df-mpo 7361 df-om 7807 df-1st 7931 df-2nd 7932 df-frecs 8220 df-wrecs 8251 df-recs 8300 df-rdg 8338 df-1o 8394 df-er 8632 df-map 8764 df-en 8883 df-dom 8884 df-sdom 8885 df-fin 8886 df-oi 9414 df-card 9852 df-acn 9855 df-ac 10027 |
| This theorem is referenced by: abrexctf 32778 |
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