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Mirrors > Home > MPE Home > Th. List > hashun2 | Structured version Visualization version GIF version |
Description: The size of the union of finite sets is less than or equal to the sum of their sizes. (Contributed by Mario Carneiro, 23-Sep-2013.) (Proof shortened by Mario Carneiro, 27-Jul-2014.) |
Ref | Expression |
---|---|
hashun2 | ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐴 ∪ 𝐵)) ≤ ((♯‘𝐴) + (♯‘𝐵))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | undif2 4427 | . . . 4 ⊢ (𝐴 ∪ (𝐵 ∖ 𝐴)) = (𝐴 ∪ 𝐵) | |
2 | 1 | fveq2i 6675 | . . 3 ⊢ (♯‘(𝐴 ∪ (𝐵 ∖ 𝐴))) = (♯‘(𝐴 ∪ 𝐵)) |
3 | diffi 8752 | . . . 4 ⊢ (𝐵 ∈ Fin → (𝐵 ∖ 𝐴) ∈ Fin) | |
4 | disjdif 4423 | . . . . 5 ⊢ (𝐴 ∩ (𝐵 ∖ 𝐴)) = ∅ | |
5 | hashun 13746 | . . . . 5 ⊢ ((𝐴 ∈ Fin ∧ (𝐵 ∖ 𝐴) ∈ Fin ∧ (𝐴 ∩ (𝐵 ∖ 𝐴)) = ∅) → (♯‘(𝐴 ∪ (𝐵 ∖ 𝐴))) = ((♯‘𝐴) + (♯‘(𝐵 ∖ 𝐴)))) | |
6 | 4, 5 | mp3an3 1446 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ (𝐵 ∖ 𝐴) ∈ Fin) → (♯‘(𝐴 ∪ (𝐵 ∖ 𝐴))) = ((♯‘𝐴) + (♯‘(𝐵 ∖ 𝐴)))) |
7 | 3, 6 | sylan2 594 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐴 ∪ (𝐵 ∖ 𝐴))) = ((♯‘𝐴) + (♯‘(𝐵 ∖ 𝐴)))) |
8 | 2, 7 | syl5eqr 2872 | . 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐴 ∪ 𝐵)) = ((♯‘𝐴) + (♯‘(𝐵 ∖ 𝐴)))) |
9 | 3 | adantl 484 | . . . . 5 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (𝐵 ∖ 𝐴) ∈ Fin) |
10 | hashcl 13720 | . . . . 5 ⊢ ((𝐵 ∖ 𝐴) ∈ Fin → (♯‘(𝐵 ∖ 𝐴)) ∈ ℕ0) | |
11 | 9, 10 | syl 17 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐵 ∖ 𝐴)) ∈ ℕ0) |
12 | 11 | nn0red 11959 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐵 ∖ 𝐴)) ∈ ℝ) |
13 | hashcl 13720 | . . . . 5 ⊢ (𝐵 ∈ Fin → (♯‘𝐵) ∈ ℕ0) | |
14 | 13 | adantl 484 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘𝐵) ∈ ℕ0) |
15 | 14 | nn0red 11959 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘𝐵) ∈ ℝ) |
16 | hashcl 13720 | . . . . 5 ⊢ (𝐴 ∈ Fin → (♯‘𝐴) ∈ ℕ0) | |
17 | 16 | adantr 483 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘𝐴) ∈ ℕ0) |
18 | 17 | nn0red 11959 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘𝐴) ∈ ℝ) |
19 | simpr 487 | . . . . 5 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → 𝐵 ∈ Fin) | |
20 | difss 4110 | . . . . 5 ⊢ (𝐵 ∖ 𝐴) ⊆ 𝐵 | |
21 | ssdomg 8557 | . . . . 5 ⊢ (𝐵 ∈ Fin → ((𝐵 ∖ 𝐴) ⊆ 𝐵 → (𝐵 ∖ 𝐴) ≼ 𝐵)) | |
22 | 19, 20, 21 | mpisyl 21 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (𝐵 ∖ 𝐴) ≼ 𝐵) |
23 | hashdom 13743 | . . . . 5 ⊢ (((𝐵 ∖ 𝐴) ∈ Fin ∧ 𝐵 ∈ Fin) → ((♯‘(𝐵 ∖ 𝐴)) ≤ (♯‘𝐵) ↔ (𝐵 ∖ 𝐴) ≼ 𝐵)) | |
24 | 9, 23 | sylancom 590 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → ((♯‘(𝐵 ∖ 𝐴)) ≤ (♯‘𝐵) ↔ (𝐵 ∖ 𝐴) ≼ 𝐵)) |
25 | 22, 24 | mpbird 259 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐵 ∖ 𝐴)) ≤ (♯‘𝐵)) |
26 | 12, 15, 18, 25 | leadd2dd 11257 | . 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → ((♯‘𝐴) + (♯‘(𝐵 ∖ 𝐴))) ≤ ((♯‘𝐴) + (♯‘𝐵))) |
27 | 8, 26 | eqbrtrd 5090 | 1 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐴 ∪ 𝐵)) ≤ ((♯‘𝐴) + (♯‘𝐵))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 = wceq 1537 ∈ wcel 2114 ∖ cdif 3935 ∪ cun 3936 ∩ cin 3937 ⊆ wss 3938 ∅c0 4293 class class class wbr 5068 ‘cfv 6357 (class class class)co 7158 ≼ cdom 8509 Fincfn 8511 + caddc 10542 ≤ cle 10678 ℕ0cn0 11900 ♯chash 13693 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-rep 5192 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-cnex 10595 ax-resscn 10596 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-addrcl 10600 ax-mulcl 10601 ax-mulrcl 10602 ax-mulcom 10603 ax-addass 10604 ax-mulass 10605 ax-distr 10606 ax-i2m1 10607 ax-1ne0 10608 ax-1rid 10609 ax-rnegex 10610 ax-rrecex 10611 ax-cnre 10612 ax-pre-lttri 10613 ax-pre-lttrn 10614 ax-pre-ltadd 10615 ax-pre-mulgt0 10616 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-reu 3147 df-rmo 3148 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-pss 3956 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-tp 4574 df-op 4576 df-uni 4841 df-int 4879 df-iun 4923 df-br 5069 df-opab 5131 df-mpt 5149 df-tr 5175 df-id 5462 df-eprel 5467 df-po 5476 df-so 5477 df-fr 5516 df-we 5518 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-pred 6150 df-ord 6196 df-on 6197 df-lim 6198 df-suc 6199 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-riota 7116 df-ov 7161 df-oprab 7162 df-mpo 7163 df-om 7583 df-1st 7691 df-2nd 7692 df-wrecs 7949 df-recs 8010 df-rdg 8048 df-1o 8104 df-oadd 8108 df-er 8291 df-en 8512 df-dom 8513 df-sdom 8514 df-fin 8515 df-dju 9332 df-card 9370 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-sub 10874 df-neg 10875 df-nn 11641 df-n0 11901 df-xnn0 11971 df-z 11985 df-uz 12247 df-fz 12896 df-hash 13694 |
This theorem is referenced by: hashunlei 13789 hashfun 13801 prmreclem4 16257 fta1glem2 24762 fta1lem 24898 vieta1lem2 24902 |
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