Theorem uniimadom 9245

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.)

Hypotheses

Ref	Expression
uniimadom.1	⊢ 𝐴 ∈ V
uniimadom.2	⊢ 𝐵 ∈ V

Assertion

Ref	Expression
uniimadom	⊢ ((Fun 𝐹 ∧ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵) → ∪ (𝐹 “ 𝐴) ≼ (𝐴 × 𝐵))

Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑥,𝐹

Proof of Theorem uniimadom

Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		uniimadom.1	. . . . 5 ⊢ 𝐴 ∈ V
2	1	funimaex 5890	. . . 4 ⊢ (Fun 𝐹 → (𝐹 “ 𝐴) ∈ V)
3	2	adantr 480	. . 3 ⊢ ((Fun 𝐹 ∧ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵) → (𝐹 “ 𝐴) ∈ V)
4		fvelima 6158	. . . . . . . 8 ⊢ ((Fun 𝐹 ∧ 𝑦 ∈ (𝐹 “ 𝐴)) → ∃𝑥 ∈ 𝐴 (𝐹‘𝑥) = 𝑦)
5	4	ex 449	. . . . . . 7 ⊢ (Fun 𝐹 → (𝑦 ∈ (𝐹 “ 𝐴) → ∃𝑥 ∈ 𝐴 (𝐹‘𝑥) = 𝑦))
6		breq1 4586	. . . . . . . . . 10 ⊢ ((𝐹‘𝑥) = 𝑦 → ((𝐹‘𝑥) ≼ 𝐵 ↔ 𝑦 ≼ 𝐵))
7	6	biimpd 218	. . . . . . . . 9 ⊢ ((𝐹‘𝑥) = 𝑦 → ((𝐹‘𝑥) ≼ 𝐵 → 𝑦 ≼ 𝐵))
8	7	reximi 2994	. . . . . . . 8 ⊢ (∃𝑥 ∈ 𝐴 (𝐹‘𝑥) = 𝑦 → ∃𝑥 ∈ 𝐴 ((𝐹‘𝑥) ≼ 𝐵 → 𝑦 ≼ 𝐵))
9		r19.36v 3066	. . . . . . . 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 34	. . . . . 6 ⊢ (Fun 𝐹 → (𝑦 ∈ (𝐹 “ 𝐴) → (∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵 → 𝑦 ≼ 𝐵)))
12	11	com23 84	. . . . 5 ⊢ (Fun 𝐹 → (∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵 → (𝑦 ∈ (𝐹 “ 𝐴) → 𝑦 ≼ 𝐵)))
13	12	imp 444	. . . 4 ⊢ ((Fun 𝐹 ∧ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵) → (𝑦 ∈ (𝐹 “ 𝐴) → 𝑦 ≼ 𝐵))
14	13	ralrimiv 2948	. . 3 ⊢ ((Fun 𝐹 ∧ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵) → ∀𝑦 ∈ (𝐹 “ 𝐴)𝑦 ≼ 𝐵)
15		unidom 9244	. . 3 ⊢ (((𝐹 “ 𝐴) ∈ V ∧ ∀𝑦 ∈ (𝐹 “ 𝐴)𝑦 ≼ 𝐵) → ∪ (𝐹 “ 𝐴) ≼ ((𝐹 “ 𝐴) × 𝐵))
16	3, 14, 15	syl2anc 691	. 2 ⊢ ((Fun 𝐹 ∧ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵) → ∪ (𝐹 “ 𝐴) ≼ ((𝐹 “ 𝐴) × 𝐵))
17		imadomg 9237	. . . . 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 7944	. . . 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 7895	. 2 ⊢ ((∪ (𝐹 “ 𝐴) ≼ ((𝐹 “ 𝐴) × 𝐵) ∧ ((𝐹 “ 𝐴) × 𝐵) ≼ (𝐴 × 𝐵)) → ∪ (𝐹 “ 𝐴) ≼ (𝐴 × 𝐵))
24	16, 22, 23	syl2anc 691	1 ⊢ ((Fun 𝐹 ∧ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵) → ∪ (𝐹 “ 𝐴) ≼ (𝐴 × 𝐵))

Syntax hints:   → wi 4   ∧ wa 383   = wceq 1475   ∈ wcel 1977  ∀wral 2896  ∃wrex 2897  Vcvv 3173  ∪ cuni 4372   class class class wbr 4583   × cxp 5036   “ cima 5041  Fun wfun 5798  ‘cfv 5804   ≼ cdom 7839

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-ac2 9168

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-se 4998  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-isom 5813  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-er 7629  df-map 7746  df-en 7842  df-dom 7843  df-card 8648  df-acn 8651  df-ac 8822

This theorem is referenced by:  uniimadomf  9246