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Theorem hashun2 14419

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.)

**Assertion**
Ref	Expression
hashun2	⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐴 ∪ 𝐵)) ≤ ((♯‘𝐴) + (♯‘𝐵)))

**Proof of Theorem hashun2**
Step	Hyp	Ref	Expression
1		undif2 4483	. . . 4 ⊢ (𝐴 ∪ (𝐵 ∖ 𝐴)) = (𝐴 ∪ 𝐵)
2	1	fveq2i 6910	. . 3 ⊢ (♯‘(𝐴 ∪ (𝐵 ∖ 𝐴))) = (♯‘(𝐴 ∪ 𝐵))
3		diffi 9214	. . . 4 ⊢ (𝐵 ∈ Fin → (𝐵 ∖ 𝐴) ∈ Fin)
4		disjdif 4478	. . . . 5 ⊢ (𝐴 ∩ (𝐵 ∖ 𝐴)) = ∅
5		hashun 14418	. . . . 5 ⊢ ((𝐴 ∈ Fin ∧ (𝐵 ∖ 𝐴) ∈ Fin ∧ (𝐴 ∩ (𝐵 ∖ 𝐴)) = ∅) → (♯‘(𝐴 ∪ (𝐵 ∖ 𝐴))) = ((♯‘𝐴) + (♯‘(𝐵 ∖ 𝐴))))
6	4, 5	mp3an3 1449	. . . 4 ⊢ ((𝐴 ∈ Fin ∧ (𝐵 ∖ 𝐴) ∈ Fin) → (♯‘(𝐴 ∪ (𝐵 ∖ 𝐴))) = ((♯‘𝐴) + (♯‘(𝐵 ∖ 𝐴))))
7	3, 6	sylan2 593	. . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐴 ∪ (𝐵 ∖ 𝐴))) = ((♯‘𝐴) + (♯‘(𝐵 ∖ 𝐴))))
8	2, 7	eqtr3id 2789	. 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐴 ∪ 𝐵)) = ((♯‘𝐴) + (♯‘(𝐵 ∖ 𝐴))))
9	3	adantl 481	. . . . 5 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (𝐵 ∖ 𝐴) ∈ Fin)
10		hashcl 14392	. . . . 5 ⊢ ((𝐵 ∖ 𝐴) ∈ Fin → (♯‘(𝐵 ∖ 𝐴)) ∈ ℕ₀)
11	9, 10	syl 17	. . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐵 ∖ 𝐴)) ∈ ℕ₀)
12	11	nn0red 12586	. . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐵 ∖ 𝐴)) ∈ ℝ)
13		hashcl 14392	. . . . 5 ⊢ (𝐵 ∈ Fin → (♯‘𝐵) ∈ ℕ₀)
14	13	adantl 481	. . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘𝐵) ∈ ℕ₀)
15	14	nn0red 12586	. . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘𝐵) ∈ ℝ)
16		hashcl 14392	. . . . 5 ⊢ (𝐴 ∈ Fin → (♯‘𝐴) ∈ ℕ₀)
17	16	adantr 480	. . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘𝐴) ∈ ℕ₀)
18	17	nn0red 12586	. . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘𝐴) ∈ ℝ)
19		simpr 484	. . . . 5 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → 𝐵 ∈ Fin)
20		difss 4146	. . . . 5 ⊢ (𝐵 ∖ 𝐴) ⊆ 𝐵
21		ssdomg 9039	. . . . 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 14415	. . . . 5 ⊢ (((𝐵 ∖ 𝐴) ∈ Fin ∧ 𝐵 ∈ Fin) → ((♯‘(𝐵 ∖ 𝐴)) ≤ (♯‘𝐵) ↔ (𝐵 ∖ 𝐴) ≼ 𝐵))
24	9, 23	sylancom 588	. . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → ((♯‘(𝐵 ∖ 𝐴)) ≤ (♯‘𝐵) ↔ (𝐵 ∖ 𝐴) ≼ 𝐵))
25	22, 24	mpbird 257	. . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐵 ∖ 𝐴)) ≤ (♯‘𝐵))
26	12, 15, 18, 25	leadd2dd 11876	. 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → ((♯‘𝐴) + (♯‘(𝐵 ∖ 𝐴))) ≤ ((♯‘𝐴) + (♯‘𝐵)))
27	8, 26	eqbrtrd 5170	1 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐴 ∪ 𝐵)) ≤ ((♯‘𝐴) + (♯‘𝐵)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1537 ∈ wcel 2106 ∖ cdif 3960 ∪ cun 3961 ∩ cin 3962 ⊆ wss 3963 ∅c0 4339 class class class wbr 5148 ‘cfv 6563 (class class class)co 7431 ≼ cdom 8982 Fincfn 8984 + caddc 11156 ≤ cle 11294 ℕ₀cn0 12524 ♯chash 14366

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 ax-cnex 11209 ax-resscn 11210 ax-1cn 11211 ax-icn 11212 ax-addcl 11213 ax-addrcl 11214 ax-mulcl 11215 ax-mulrcl 11216 ax-mulcom 11217 ax-addass 11218 ax-mulass 11219 ax-distr 11220 ax-i2m1 11221 ax-1ne0 11222 ax-1rid 11223 ax-rnegex 11224 ax-rrecex 11225 ax-cnre 11226 ax-pre-lttri 11227 ax-pre-lttrn 11228 ax-pre-ltadd 11229 ax-pre-mulgt0 11230

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-op 4638 df-uni 4913 df-int 4952 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5583 df-eprel 5589 df-po 5597 df-so 5598 df-fr 5641 df-we 5643 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-pred 6323 df-ord 6389 df-on 6390 df-lim 6391 df-suc 6392 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-om 7888 df-1st 8013 df-2nd 8014 df-frecs 8305 df-wrecs 8336 df-recs 8410 df-rdg 8449 df-1o 8505 df-oadd 8509 df-er 8744 df-en 8985 df-dom 8986 df-sdom 8987 df-fin 8988 df-dju 9939 df-card 9977 df-pnf 11295 df-mnf 11296 df-xr 11297 df-ltxr 11298 df-le 11299 df-sub 11492 df-neg 11493 df-nn 12265 df-n0 12525 df-xnn0 12598 df-z 12612 df-uz 12877 df-fz 13545 df-hash 14367

This theorem is referenced by: hashunlei 14461 hashfun 14473 prmreclem4 16953 fta1glem2 26223 fta1lem 26364 vieta1lem2 26368

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