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Mirrors > Home > MPE Home > Th. List > imadomg | Structured version Visualization version GIF version |
Description: An image of a function under a set is dominated by the set. Proposition 10.34 of [TakeutiZaring] p. 92. (Contributed by NM, 23-Jul-2004.) |
Ref | Expression |
---|---|
imadomg | ⊢ (𝐴 ∈ 𝐵 → (Fun 𝐹 → (𝐹 “ 𝐴) ≼ 𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ima 5540 | . . . 4 ⊢ (𝐹 “ 𝐴) = ran (𝐹 ↾ 𝐴) | |
2 | resfunexg 6974 | . . . . . 6 ⊢ ((Fun 𝐹 ∧ 𝐴 ∈ 𝐵) → (𝐹 ↾ 𝐴) ∈ V) | |
3 | 2 | dmexd 7620 | . . . . 5 ⊢ ((Fun 𝐹 ∧ 𝐴 ∈ 𝐵) → dom (𝐹 ↾ 𝐴) ∈ V) |
4 | funres 6381 | . . . . . . 7 ⊢ (Fun 𝐹 → Fun (𝐹 ↾ 𝐴)) | |
5 | funforn 6587 | . . . . . . 7 ⊢ (Fun (𝐹 ↾ 𝐴) ↔ (𝐹 ↾ 𝐴):dom (𝐹 ↾ 𝐴)–onto→ran (𝐹 ↾ 𝐴)) | |
6 | 4, 5 | sylib 221 | . . . . . 6 ⊢ (Fun 𝐹 → (𝐹 ↾ 𝐴):dom (𝐹 ↾ 𝐴)–onto→ran (𝐹 ↾ 𝐴)) |
7 | 6 | adantr 484 | . . . . 5 ⊢ ((Fun 𝐹 ∧ 𝐴 ∈ 𝐵) → (𝐹 ↾ 𝐴):dom (𝐹 ↾ 𝐴)–onto→ran (𝐹 ↾ 𝐴)) |
8 | fodomg 9987 | . . . . 5 ⊢ (dom (𝐹 ↾ 𝐴) ∈ V → ((𝐹 ↾ 𝐴):dom (𝐹 ↾ 𝐴)–onto→ran (𝐹 ↾ 𝐴) → ran (𝐹 ↾ 𝐴) ≼ dom (𝐹 ↾ 𝐴))) | |
9 | 3, 7, 8 | sylc 65 | . . . 4 ⊢ ((Fun 𝐹 ∧ 𝐴 ∈ 𝐵) → ran (𝐹 ↾ 𝐴) ≼ dom (𝐹 ↾ 𝐴)) |
10 | 1, 9 | eqbrtrid 5070 | . . 3 ⊢ ((Fun 𝐹 ∧ 𝐴 ∈ 𝐵) → (𝐹 “ 𝐴) ≼ dom (𝐹 ↾ 𝐴)) |
11 | 10 | expcom 417 | . 2 ⊢ (𝐴 ∈ 𝐵 → (Fun 𝐹 → (𝐹 “ 𝐴) ≼ dom (𝐹 ↾ 𝐴))) |
12 | dmres 5849 | . . . . . 6 ⊢ dom (𝐹 ↾ 𝐴) = (𝐴 ∩ dom 𝐹) | |
13 | inss1 4135 | . . . . . 6 ⊢ (𝐴 ∩ dom 𝐹) ⊆ 𝐴 | |
14 | 12, 13 | eqsstri 3928 | . . . . 5 ⊢ dom (𝐹 ↾ 𝐴) ⊆ 𝐴 |
15 | ssdomg 8578 | . . . . 5 ⊢ (𝐴 ∈ 𝐵 → (dom (𝐹 ↾ 𝐴) ⊆ 𝐴 → dom (𝐹 ↾ 𝐴) ≼ 𝐴)) | |
16 | 14, 15 | mpi 20 | . . . 4 ⊢ (𝐴 ∈ 𝐵 → dom (𝐹 ↾ 𝐴) ≼ 𝐴) |
17 | domtr 8585 | . . . 4 ⊢ (((𝐹 “ 𝐴) ≼ dom (𝐹 ↾ 𝐴) ∧ dom (𝐹 ↾ 𝐴) ≼ 𝐴) → (𝐹 “ 𝐴) ≼ 𝐴) | |
18 | 16, 17 | sylan2 595 | . . 3 ⊢ (((𝐹 “ 𝐴) ≼ dom (𝐹 ↾ 𝐴) ∧ 𝐴 ∈ 𝐵) → (𝐹 “ 𝐴) ≼ 𝐴) |
19 | 18 | expcom 417 | . 2 ⊢ (𝐴 ∈ 𝐵 → ((𝐹 “ 𝐴) ≼ dom (𝐹 ↾ 𝐴) → (𝐹 “ 𝐴) ≼ 𝐴)) |
20 | 11, 19 | syld 47 | 1 ⊢ (𝐴 ∈ 𝐵 → (Fun 𝐹 → (𝐹 “ 𝐴) ≼ 𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 ∈ wcel 2111 Vcvv 3409 ∩ cin 3859 ⊆ wss 3860 class class class wbr 5035 dom cdm 5527 ran crn 5528 ↾ cres 5529 “ cima 5530 Fun wfun 6333 –onto→wfo 6337 ≼ cdom 8530 |
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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2729 ax-rep 5159 ax-sep 5172 ax-nul 5179 ax-pow 5237 ax-pr 5301 ax-un 7464 ax-ac2 9928 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-fal 1551 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2557 df-eu 2588 df-clab 2736 df-cleq 2750 df-clel 2830 df-nfc 2901 df-ne 2952 df-ral 3075 df-rex 3076 df-reu 3077 df-rmo 3078 df-rab 3079 df-v 3411 df-sbc 3699 df-csb 3808 df-dif 3863 df-un 3865 df-in 3867 df-ss 3877 df-pss 3879 df-nul 4228 df-if 4424 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4802 df-int 4842 df-iun 4888 df-br 5036 df-opab 5098 df-mpt 5116 df-tr 5142 df-id 5433 df-eprel 5438 df-po 5446 df-so 5447 df-fr 5486 df-se 5487 df-we 5488 df-xp 5533 df-rel 5534 df-cnv 5535 df-co 5536 df-dm 5537 df-rn 5538 df-res 5539 df-ima 5540 df-pred 6130 df-ord 6176 df-on 6177 df-suc 6179 df-iota 6298 df-fun 6341 df-fn 6342 df-f 6343 df-f1 6344 df-fo 6345 df-f1o 6346 df-fv 6347 df-isom 6348 df-riota 7113 df-ov 7158 df-oprab 7159 df-mpo 7160 df-1st 7698 df-2nd 7699 df-wrecs 7962 df-recs 8023 df-er 8304 df-map 8423 df-en 8533 df-dom 8534 df-card 9406 df-acn 9409 df-ac 9581 |
This theorem is referenced by: fimact 10000 uniimadom 10009 hausmapdom 22205 |
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