Theorem uniimadomf 10583

Description: An upper bound for the cardinality of the union of an image. Theorem 10.48 of [TakeutiZaring] p. 99. This version of uniimadom 10582 uses a bound-variable hypothesis in place of a distinct variable condition. (Contributed by NM, 26-Mar-2006.)

Hypotheses

Ref	Expression
uniimadomf.1	⊢ Ⅎ𝑥𝐹
uniimadomf.2	⊢ 𝐴 ∈ V
uniimadomf.3	⊢ 𝐵 ∈ V

Assertion

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

Distinct variable groups:   𝑥,𝐴   𝑥,𝐵

Allowed substitution hint:   𝐹(𝑥)

Proof of Theorem uniimadomf

Dummy variable 𝑧 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		nfv 1912	. . 3 ⊢ Ⅎ𝑧(𝐹‘𝑥) ≼ 𝐵
2		uniimadomf.1	. . . . 5 ⊢ Ⅎ𝑥𝐹
3		nfcv 2903	. . . . 5 ⊢ Ⅎ𝑥𝑧
4	2, 3	nffv 6917	. . . 4 ⊢ Ⅎ𝑥(𝐹‘𝑧)
5		nfcv 2903	. . . 4 ⊢ Ⅎ𝑥 ≼
6		nfcv 2903	. . . 4 ⊢ Ⅎ𝑥𝐵
7	4, 5, 6	nfbr 5195	. . 3 ⊢ Ⅎ𝑥(𝐹‘𝑧) ≼ 𝐵
8		fveq2 6907	. . . 4 ⊢ (𝑥 = 𝑧 → (𝐹‘𝑥) = (𝐹‘𝑧))
9	8	breq1d 5158	. . 3 ⊢ (𝑥 = 𝑧 → ((𝐹‘𝑥) ≼ 𝐵 ↔ (𝐹‘𝑧) ≼ 𝐵))
10	1, 7, 9	cbvralw 3304	. 2 ⊢ (∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵 ↔ ∀𝑧 ∈ 𝐴 (𝐹‘𝑧) ≼ 𝐵)
11		uniimadomf.2	. . 3 ⊢ 𝐴 ∈ V
12		uniimadomf.3	. . 3 ⊢ 𝐵 ∈ V
13	11, 12	uniimadom 10582	. 2 ⊢ ((Fun 𝐹 ∧ ∀𝑧 ∈ 𝐴 (𝐹‘𝑧) ≼ 𝐵) → ∪ (𝐹 “ 𝐴) ≼ (𝐴 × 𝐵))
14	10, 13	sylan2b 594	1 ⊢ ((Fun 𝐹 ∧ ∀𝑥 ∈ 𝐴 (𝐹‘𝑥) ≼ 𝐵) → ∪ (𝐹 “ 𝐴) ≼ (𝐴 × 𝐵))

Syntax hints:   → wi 4   ∧ wa 395   ∈ wcel 2106  Ⅎwnfc 2888  ∀wral 3059  Vcvv 3478  ∪ cuni 4912   class class class wbr 5148   × cxp 5687   “ cima 5692  Fun wfun 6557  ‘cfv 6563   ≼ cdom 8982

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-rep 5285  ax-sep 5302  ax-nul 5312  ax-pow 5371  ax-pr 5438  ax-un 7754  ax-ac2 10501

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-ral 3060  df-rex 3069  df-rmo 3378  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-se 5642  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-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-isom 6572  df-riota 7388  df-ov 7434  df-oprab 7435  df-mpo 7436  df-1st 8013  df-2nd 8014  df-frecs 8305  df-wrecs 8336  df-recs 8410  df-er 8744  df-map 8867  df-en 8985  df-dom 8986  df-card 9977  df-acn 9980  df-ac 10154

This theorem is referenced by: (None)