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Theorem hashunx 14435

Description: The size of the union of disjoint sets is the result of the extended real addition of their sizes, analogous to hashun 14431. (Contributed by Alexander van der Vekens, 21-Dec-2017.)

**Assertion**
Ref	Expression
hashunx	⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (♯‘(𝐴 ∪ 𝐵)) = ((♯‘𝐴) +_𝑒 (♯‘𝐵)))

**Proof of Theorem hashunx**
Step	Hyp	Ref	Expression
1		hashun 14431	. . . . . 6 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin ∧ (𝐴 ∩ 𝐵) = ∅) → (♯‘(𝐴 ∪ 𝐵)) = ((♯‘𝐴) + (♯‘𝐵)))
2	1	3expa 1118	. . . . 5 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) ∧ (𝐴 ∩ 𝐵) = ∅) → (♯‘(𝐴 ∪ 𝐵)) = ((♯‘𝐴) + (♯‘𝐵)))
3		hashcl 14405	. . . . . . . . . 10 ⊢ (𝐴 ∈ Fin → (♯‘𝐴) ∈ ℕ₀)
4	3	nn0red 12614	. . . . . . . . 9 ⊢ (𝐴 ∈ Fin → (♯‘𝐴) ∈ ℝ)
5		hashcl 14405	. . . . . . . . . 10 ⊢ (𝐵 ∈ Fin → (♯‘𝐵) ∈ ℕ₀)
6	5	nn0red 12614	. . . . . . . . 9 ⊢ (𝐵 ∈ Fin → (♯‘𝐵) ∈ ℝ)
7	4, 6	anim12i 612	. . . . . . . 8 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → ((♯‘𝐴) ∈ ℝ ∧ (♯‘𝐵) ∈ ℝ))
8	7	adantr 480	. . . . . . 7 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) ∧ (𝐴 ∩ 𝐵) = ∅) → ((♯‘𝐴) ∈ ℝ ∧ (♯‘𝐵) ∈ ℝ))
9		rexadd 13294	. . . . . . 7 ⊢ (((♯‘𝐴) ∈ ℝ ∧ (♯‘𝐵) ∈ ℝ) → ((♯‘𝐴) +_𝑒 (♯‘𝐵)) = ((♯‘𝐴) + (♯‘𝐵)))
10	8, 9	syl 17	. . . . . 6 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) ∧ (𝐴 ∩ 𝐵) = ∅) → ((♯‘𝐴) +_𝑒 (♯‘𝐵)) = ((♯‘𝐴) + (♯‘𝐵)))
11	10	eqcomd 2746	. . . . 5 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) ∧ (𝐴 ∩ 𝐵) = ∅) → ((♯‘𝐴) + (♯‘𝐵)) = ((♯‘𝐴) +_𝑒 (♯‘𝐵)))
12	2, 11	eqtrd 2780	. . . 4 ⊢ (((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) ∧ (𝐴 ∩ 𝐵) = ∅) → (♯‘(𝐴 ∪ 𝐵)) = ((♯‘𝐴) +_𝑒 (♯‘𝐵)))
13	12	expcom 413	. . 3 ⊢ ((𝐴 ∩ 𝐵) = ∅ → ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐴 ∪ 𝐵)) = ((♯‘𝐴) +_𝑒 (♯‘𝐵))))
14	13	3ad2ant3 1135	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐴 ∪ 𝐵)) = ((♯‘𝐴) +_𝑒 (♯‘𝐵))))
15		unexg 7778	. . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∪ 𝐵) ∈ V)
16		unfir 9374	. . . . . . 7 ⊢ ((𝐴 ∪ 𝐵) ∈ Fin → (𝐴 ∈ Fin ∧ 𝐵 ∈ Fin))
17	16	con3i 154	. . . . . 6 ⊢ (¬ (𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → ¬ (𝐴 ∪ 𝐵) ∈ Fin)
18		hashinf 14384	. . . . . 6 ⊢ (((𝐴 ∪ 𝐵) ∈ V ∧ ¬ (𝐴 ∪ 𝐵) ∈ Fin) → (♯‘(𝐴 ∪ 𝐵)) = +∞)
19	15, 17, 18	syl2anr 596	. . . . 5 ⊢ ((¬ (𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → (♯‘(𝐴 ∪ 𝐵)) = +∞)
20		ianor 982	. . . . . . 7 ⊢ (¬ (𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) ↔ (¬ 𝐴 ∈ Fin ∨ ¬ 𝐵 ∈ Fin))
21		simprl 770	. . . . . . . . . . 11 ⊢ ((¬ 𝐴 ∈ Fin ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → 𝐴 ∈ 𝑉)
22		simprr 772	. . . . . . . . . . 11 ⊢ ((¬ 𝐴 ∈ Fin ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → 𝐵 ∈ 𝑊)
23		hashnfinnn0 14410	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ Fin) → (♯‘𝐴) ∉ ℕ₀)
24	23	ex 412	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ 𝑉 → (¬ 𝐴 ∈ Fin → (♯‘𝐴) ∉ ℕ₀))
25	24	adantr 480	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (¬ 𝐴 ∈ Fin → (♯‘𝐴) ∉ ℕ₀))
26	25	impcom 407	. . . . . . . . . . 11 ⊢ ((¬ 𝐴 ∈ Fin ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → (♯‘𝐴) ∉ ℕ₀)
27		hashinfxadd 14434	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (♯‘𝐴) ∉ ℕ₀) → ((♯‘𝐴) +_𝑒 (♯‘𝐵)) = +∞)
28	21, 22, 26, 27	syl3anc 1371	. . . . . . . . . 10 ⊢ ((¬ 𝐴 ∈ Fin ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → ((♯‘𝐴) +_𝑒 (♯‘𝐵)) = +∞)
29	28	eqcomd 2746	. . . . . . . . 9 ⊢ ((¬ 𝐴 ∈ Fin ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → +∞ = ((♯‘𝐴) +_𝑒 (♯‘𝐵)))
30	29	ex 412	. . . . . . . 8 ⊢ (¬ 𝐴 ∈ Fin → ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → +∞ = ((♯‘𝐴) +_𝑒 (♯‘𝐵))))
31		hashxrcl 14406	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ 𝑉 → (♯‘𝐴) ∈ ℝ^*)
32		hashxrcl 14406	. . . . . . . . . . . . . 14 ⊢ (𝐵 ∈ 𝑊 → (♯‘𝐵) ∈ ℝ^*)
33	31, 32	anim12i 612	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ((♯‘𝐴) ∈ ℝ^* ∧ (♯‘𝐵) ∈ ℝ^*))
34	33	adantl 481	. . . . . . . . . . . 12 ⊢ ((¬ 𝐵 ∈ Fin ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → ((♯‘𝐴) ∈ ℝ^* ∧ (♯‘𝐵) ∈ ℝ^*))
35		xaddcom 13302	. . . . . . . . . . . 12 ⊢ (((♯‘𝐴) ∈ ℝ^* ∧ (♯‘𝐵) ∈ ℝ^*) → ((♯‘𝐴) +_𝑒 (♯‘𝐵)) = ((♯‘𝐵) +_𝑒 (♯‘𝐴)))
36	34, 35	syl 17	. . . . . . . . . . 11 ⊢ ((¬ 𝐵 ∈ Fin ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → ((♯‘𝐴) +_𝑒 (♯‘𝐵)) = ((♯‘𝐵) +_𝑒 (♯‘𝐴)))
37		simprr 772	. . . . . . . . . . . 12 ⊢ ((¬ 𝐵 ∈ Fin ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → 𝐵 ∈ 𝑊)
38		simprl 770	. . . . . . . . . . . 12 ⊢ ((¬ 𝐵 ∈ Fin ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → 𝐴 ∈ 𝑉)
39		hashnfinnn0 14410	. . . . . . . . . . . . . . 15 ⊢ ((𝐵 ∈ 𝑊 ∧ ¬ 𝐵 ∈ Fin) → (♯‘𝐵) ∉ ℕ₀)
40	39	ex 412	. . . . . . . . . . . . . 14 ⊢ (𝐵 ∈ 𝑊 → (¬ 𝐵 ∈ Fin → (♯‘𝐵) ∉ ℕ₀))
41	40	adantl 481	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (¬ 𝐵 ∈ Fin → (♯‘𝐵) ∉ ℕ₀))
42	41	impcom 407	. . . . . . . . . . . 12 ⊢ ((¬ 𝐵 ∈ Fin ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → (♯‘𝐵) ∉ ℕ₀)
43		hashinfxadd 14434	. . . . . . . . . . . 12 ⊢ ((𝐵 ∈ 𝑊 ∧ 𝐴 ∈ 𝑉 ∧ (♯‘𝐵) ∉ ℕ₀) → ((♯‘𝐵) +_𝑒 (♯‘𝐴)) = +∞)
44	37, 38, 42, 43	syl3anc 1371	. . . . . . . . . . 11 ⊢ ((¬ 𝐵 ∈ Fin ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → ((♯‘𝐵) +_𝑒 (♯‘𝐴)) = +∞)
45	36, 44	eqtrd 2780	. . . . . . . . . 10 ⊢ ((¬ 𝐵 ∈ Fin ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → ((♯‘𝐴) +_𝑒 (♯‘𝐵)) = +∞)
46	45	eqcomd 2746	. . . . . . . . 9 ⊢ ((¬ 𝐵 ∈ Fin ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → +∞ = ((♯‘𝐴) +_𝑒 (♯‘𝐵)))
47	46	ex 412	. . . . . . . 8 ⊢ (¬ 𝐵 ∈ Fin → ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → +∞ = ((♯‘𝐴) +_𝑒 (♯‘𝐵))))
48	30, 47	jaoi 856	. . . . . . 7 ⊢ ((¬ 𝐴 ∈ Fin ∨ ¬ 𝐵 ∈ Fin) → ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → +∞ = ((♯‘𝐴) +_𝑒 (♯‘𝐵))))
49	20, 48	sylbi 217	. . . . . 6 ⊢ (¬ (𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → +∞ = ((♯‘𝐴) +_𝑒 (♯‘𝐵))))
50	49	imp 406	. . . . 5 ⊢ ((¬ (𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → +∞ = ((♯‘𝐴) +_𝑒 (♯‘𝐵)))
51	19, 50	eqtrd 2780	. . . 4 ⊢ ((¬ (𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) ∧ (𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)) → (♯‘(𝐴 ∪ 𝐵)) = ((♯‘𝐴) +_𝑒 (♯‘𝐵)))
52	51	expcom 413	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (¬ (𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐴 ∪ 𝐵)) = ((♯‘𝐴) +_𝑒 (♯‘𝐵))))
53	52	3adant3 1132	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (¬ (𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (♯‘(𝐴 ∪ 𝐵)) = ((♯‘𝐴) +_𝑒 (♯‘𝐵))))
54	14, 53	pm2.61d 179	1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊 ∧ (𝐴 ∩ 𝐵) = ∅) → (♯‘(𝐴 ∪ 𝐵)) = ((♯‘𝐴) +_𝑒 (♯‘𝐵)))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 ∨ wo 846 ∧ w3a 1087 = wceq 1537 ∈ wcel 2108 ∉ wnel 3052 Vcvv 3488 ∪ cun 3974 ∩ cin 3975 ∅c0 4352 ‘cfv 6573 (class class class)co 7448 Fincfn 9003 ℝcr 11183 + caddc 11187 +∞cpnf 11321 ℝ^*cxr 11323 ℕ₀cn0 12553 +_𝑒 cxad 13173 ♯chash 14379

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1793 ax-4 1807 ax-5 1909 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2158 ax-12 2178 ax-ext 2711 ax-sep 5317 ax-nul 5324 ax-pow 5383 ax-pr 5447 ax-un 7770 ax-cnex 11240 ax-resscn 11241 ax-1cn 11242 ax-icn 11243 ax-addcl 11244 ax-addrcl 11245 ax-mulcl 11246 ax-mulrcl 11247 ax-mulcom 11248 ax-addass 11249 ax-mulass 11250 ax-distr 11251 ax-i2m1 11252 ax-1ne0 11253 ax-1rid 11254 ax-rnegex 11255 ax-rrecex 11256 ax-cnre 11257 ax-pre-lttri 11258 ax-pre-lttrn 11259 ax-pre-ltadd 11260 ax-pre-mulgt0 11261

This theorem depends on definitions: df-bi 207 df-an 396 df-or 847 df-3or 1088 df-3an 1089 df-tru 1540 df-fal 1550 df-ex 1778 df-nf 1782 df-sb 2065 df-mo 2543 df-eu 2572 df-clab 2718 df-cleq 2732 df-clel 2819 df-nfc 2895 df-ne 2947 df-nel 3053 df-ral 3068 df-rex 3077 df-reu 3389 df-rab 3444 df-v 3490 df-sbc 3805 df-csb 3922 df-dif 3979 df-un 3981 df-in 3983 df-ss 3993 df-pss 3996 df-nul 4353 df-if 4549 df-pw 4624 df-sn 4649 df-pr 4651 df-op 4655 df-uni 4932 df-int 4971 df-iun 5017 df-br 5167 df-opab 5229 df-mpt 5250 df-tr 5284 df-id 5593 df-eprel 5599 df-po 5607 df-so 5608 df-fr 5652 df-we 5654 df-xp 5706 df-rel 5707 df-cnv 5708 df-co 5709 df-dm 5710 df-rn 5711 df-res 5712 df-ima 5713 df-pred 6332 df-ord 6398 df-on 6399 df-lim 6400 df-suc 6401 df-iota 6525 df-fun 6575 df-fn 6576 df-f 6577 df-f1 6578 df-fo 6579 df-f1o 6580 df-fv 6581 df-riota 7404 df-ov 7451 df-oprab 7452 df-mpo 7453 df-om 7904 df-1st 8030 df-2nd 8031 df-frecs 8322 df-wrecs 8353 df-recs 8427 df-rdg 8466 df-1o 8522 df-oadd 8526 df-er 8763 df-en 9004 df-dom 9005 df-sdom 9006 df-fin 9007 df-dju 9970 df-card 10008 df-pnf 11326 df-mnf 11327 df-xr 11328 df-ltxr 11329 df-le 11330 df-sub 11522 df-neg 11523 df-nn 12294 df-n0 12554 df-xnn0 12626 df-z 12640 df-uz 12904 df-xadd 13176 df-hash 14380

This theorem is referenced by: hashunsngx 14442 vtxdun 29517 vtxdginducedm1 29579 dimkerim 33640

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