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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 6556 | . 2 ⊢ Fun (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 2 | ctex 8937 | . . . 4 ⊢ (𝐴 ≼ ω → 𝐴 ∈ V) | |
| 3 | eqid 2730 | . . . . . 6 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐴 ↦ 𝐵) | |
| 4 | 3 | dmmpt 6215 | . . . . 5 ⊢ dom (𝑥 ∈ 𝐴 ↦ 𝐵) = {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ V} |
| 5 | df-rab 3409 | . . . . . 6 ⊢ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ V} = {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝐵 ∈ V)} | |
| 6 | simpl 482 | . . . . . . . 8 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝐵 ∈ V) → 𝑥 ∈ 𝐴) | |
| 7 | 6 | ss2abi 4032 | . . . . . . 7 ⊢ {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝐵 ∈ V)} ⊆ {𝑥 ∣ 𝑥 ∈ 𝐴} |
| 8 | mptctf.1 | . . . . . . . 8 ⊢ Ⅎ𝑥𝐴 | |
| 9 | 8 | abid2f 2923 | . . . . . . 7 ⊢ {𝑥 ∣ 𝑥 ∈ 𝐴} = 𝐴 |
| 10 | 7, 9 | sseqtri 3997 | . . . . . 6 ⊢ {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝐵 ∈ V)} ⊆ 𝐴 |
| 11 | 5, 10 | eqsstri 3995 | . . . . 5 ⊢ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ V} ⊆ 𝐴 |
| 12 | 4, 11 | eqsstri 3995 | . . . 4 ⊢ dom (𝑥 ∈ 𝐴 ↦ 𝐵) ⊆ 𝐴 |
| 13 | ssdomg 8973 | . . . 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 8980 | . . 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 6548 | . . 3 ⊢ (Fun (𝑥 ∈ 𝐴 ↦ 𝐵) ↔ (𝑥 ∈ 𝐴 ↦ 𝐵) Fn dom (𝑥 ∈ 𝐴 ↦ 𝐵)) | |
| 18 | fnct 10496 | . . 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 2708 Ⅎwnfc 2877 {crab 3408 Vcvv 3450 ⊆ wss 3916 class class class wbr 5109 ↦ cmpt 5190 dom cdm 5640 Fun wfun 6507 Fn wfn 6508 ωcom 7844 ≼ cdom 8918 |
| 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 2702 ax-rep 5236 ax-sep 5253 ax-nul 5263 ax-pow 5322 ax-pr 5389 ax-un 7713 ax-inf2 9600 ax-ac2 10422 |
| 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 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-ral 3046 df-rex 3055 df-rmo 3356 df-reu 3357 df-rab 3409 df-v 3452 df-sbc 3756 df-csb 3865 df-dif 3919 df-un 3921 df-in 3923 df-ss 3933 df-pss 3936 df-nul 4299 df-if 4491 df-pw 4567 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4874 df-int 4913 df-iun 4959 df-br 5110 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5535 df-eprel 5540 df-po 5548 df-so 5549 df-fr 5593 df-se 5594 df-we 5595 df-xp 5646 df-rel 5647 df-cnv 5648 df-co 5649 df-dm 5650 df-rn 5651 df-res 5652 df-ima 5653 df-pred 6276 df-ord 6337 df-on 6338 df-lim 6339 df-suc 6340 df-iota 6466 df-fun 6515 df-fn 6516 df-f 6517 df-f1 6518 df-fo 6519 df-f1o 6520 df-fv 6521 df-isom 6522 df-riota 7346 df-ov 7392 df-oprab 7393 df-mpo 7394 df-om 7845 df-1st 7970 df-2nd 7971 df-frecs 8262 df-wrecs 8293 df-recs 8342 df-rdg 8380 df-1o 8436 df-er 8673 df-map 8803 df-en 8921 df-dom 8922 df-sdom 8923 df-fin 8924 df-oi 9469 df-card 9898 df-acn 9901 df-ac 10075 |
| This theorem is referenced by: abrexctf 32648 |
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