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| Mirrors > Home > MPE Home > Th. List > uniimadom | Structured version Visualization version GIF version | ||
| Description: An upper bound for the cardinality of the union of an image. Theorem 10.48 of [TakeutiZaring] p. 99. (Contributed by NM, 25-Mar-2006.) |
| Ref | Expression |
|---|---|
| uniimadom.1 | ⊢ 𝐴 ∈ V |
| uniimadom.2 | ⊢ 𝐵 ∈ V |
| Ref | Expression |
|---|---|
| uniimadom | ⊢ ((Fun 𝐹 ∧ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵) → ∪ (𝐹 “ 𝐴) ≼ (𝐴 × 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | uniimadom.1 | . . . . 5 ⊢ 𝐴 ∈ V | |
| 2 | 1 | funimaex 6581 | . . . 4 ⊢ (Fun 𝐹 → (𝐹 “ 𝐴) ∈ V) |
| 3 | 2 | adantr 480 | . . 3 ⊢ ((Fun 𝐹 ∧ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵) → (𝐹 “ 𝐴) ∈ V) |
| 4 | fvelima 6900 | . . . . . . . 8 ⊢ ((Fun 𝐹 ∧ 𝑦 ∈ (𝐹 “ 𝐴)) → ∃𝑥 ∈ 𝐴 (𝐹‘𝑥) = 𝑦) | |
| 5 | 4 | ex 412 | . . . . . . 7 ⊢ (Fun 𝐹 → (𝑦 ∈ (𝐹 “ 𝐴) → ∃𝑥 ∈ 𝐴 (𝐹‘𝑥) = 𝑦)) |
| 6 | breq1 5102 | . . . . . . . . . 10 ⊢ ((𝐹‘𝑥) = 𝑦 → ((𝐹‘𝑥) ≼ 𝐵 ↔ 𝑦 ≼ 𝐵)) | |
| 7 | 6 | biimpd 229 | . . . . . . . . 9 ⊢ ((𝐹‘𝑥) = 𝑦 → ((𝐹‘𝑥) ≼ 𝐵 → 𝑦 ≼ 𝐵)) |
| 8 | 7 | reximi 3075 | . . . . . . . 8 ⊢ (∃𝑥 ∈ 𝐴 (𝐹‘𝑥) = 𝑦 → ∃𝑥 ∈ 𝐴 ((𝐹‘𝑥) ≼ 𝐵 → 𝑦 ≼ 𝐵)) |
| 9 | r19.36v 3165 | . . . . . . . 8 ⊢ (∃𝑥 ∈ 𝐴 ((𝐹‘𝑥) ≼ 𝐵 → 𝑦 ≼ 𝐵) → (∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵 → 𝑦 ≼ 𝐵)) | |
| 10 | 8, 9 | syl 17 | . . . . . . 7 ⊢ (∃𝑥 ∈ 𝐴 (𝐹‘𝑥) = 𝑦 → (∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵 → 𝑦 ≼ 𝐵)) |
| 11 | 5, 10 | syl6 35 | . . . . . 6 ⊢ (Fun 𝐹 → (𝑦 ∈ (𝐹 “ 𝐴) → (∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵 → 𝑦 ≼ 𝐵))) |
| 12 | 11 | com23 86 | . . . . 5 ⊢ (Fun 𝐹 → (∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵 → (𝑦 ∈ (𝐹 “ 𝐴) → 𝑦 ≼ 𝐵))) |
| 13 | 12 | imp 406 | . . . 4 ⊢ ((Fun 𝐹 ∧ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵) → (𝑦 ∈ (𝐹 “ 𝐴) → 𝑦 ≼ 𝐵)) |
| 14 | 13 | ralrimiv 3128 | . . 3 ⊢ ((Fun 𝐹 ∧ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵) → ∀𝑦 ∈ (𝐹 “ 𝐴)𝑦 ≼ 𝐵) |
| 15 | unidom 10457 | . . 3 ⊢ (((𝐹 “ 𝐴) ∈ V ∧ ∀𝑦 ∈ (𝐹 “ 𝐴)𝑦 ≼ 𝐵) → ∪ (𝐹 “ 𝐴) ≼ ((𝐹 “ 𝐴) × 𝐵)) | |
| 16 | 3, 14, 15 | syl2anc 585 | . 2 ⊢ ((Fun 𝐹 ∧ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵) → ∪ (𝐹 “ 𝐴) ≼ ((𝐹 “ 𝐴) × 𝐵)) |
| 17 | imadomg 10448 | . . . . 5 ⊢ (𝐴 ∈ V → (Fun 𝐹 → (𝐹 “ 𝐴) ≼ 𝐴)) | |
| 18 | 1, 17 | ax-mp 5 | . . . 4 ⊢ (Fun 𝐹 → (𝐹 “ 𝐴) ≼ 𝐴) |
| 19 | uniimadom.2 | . . . . 5 ⊢ 𝐵 ∈ V | |
| 20 | 19 | xpdom1 9008 | . . . 4 ⊢ ((𝐹 “ 𝐴) ≼ 𝐴 → ((𝐹 “ 𝐴) × 𝐵) ≼ (𝐴 × 𝐵)) |
| 21 | 18, 20 | syl 17 | . . 3 ⊢ (Fun 𝐹 → ((𝐹 “ 𝐴) × 𝐵) ≼ (𝐴 × 𝐵)) |
| 22 | 21 | adantr 480 | . 2 ⊢ ((Fun 𝐹 ∧ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵) → ((𝐹 “ 𝐴) × 𝐵) ≼ (𝐴 × 𝐵)) |
| 23 | domtr 8948 | . 2 ⊢ ((∪ (𝐹 “ 𝐴) ≼ ((𝐹 “ 𝐴) × 𝐵) ∧ ((𝐹 “ 𝐴) × 𝐵) ≼ (𝐴 × 𝐵)) → ∪ (𝐹 “ 𝐴) ≼ (𝐴 × 𝐵)) | |
| 24 | 16, 22, 23 | syl2anc 585 | 1 ⊢ ((Fun 𝐹 ∧ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵) → ∪ (𝐹 “ 𝐴) ≼ (𝐴 × 𝐵)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1542 ∈ wcel 2114 ∀wral 3052 ∃wrex 3061 Vcvv 3441 ∪ cuni 4864 class class class wbr 5099 × cxp 5623 “ cima 5628 Fun wfun 6487 ‘cfv 6493 ≼ cdom 8885 |
| 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 2185 ax-ext 2709 ax-rep 5225 ax-sep 5242 ax-nul 5252 ax-pow 5311 ax-pr 5378 ax-un 7682 ax-ac2 10377 |
| 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 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3062 df-rmo 3351 df-reu 3352 df-rab 3401 df-v 3443 df-sbc 3742 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4287 df-if 4481 df-pw 4557 df-sn 4582 df-pr 4584 df-op 4588 df-uni 4865 df-int 4904 df-iun 4949 df-br 5100 df-opab 5162 df-mpt 5181 df-tr 5207 df-id 5520 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-se 5579 df-we 5580 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-pred 6260 df-ord 6321 df-on 6322 df-suc 6324 df-iota 6449 df-fun 6495 df-fn 6496 df-f 6497 df-f1 6498 df-fo 6499 df-f1o 6500 df-fv 6501 df-isom 6502 df-riota 7317 df-ov 7363 df-oprab 7364 df-mpo 7365 df-1st 7935 df-2nd 7936 df-frecs 8225 df-wrecs 8256 df-recs 8305 df-er 8637 df-map 8769 df-en 8888 df-dom 8889 df-card 9855 df-acn 9858 df-ac 10030 |
| This theorem is referenced by: uniimadomf 10459 |
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