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Theorem iundomg 10463
Description: An upper bound for the cardinality of an indexed union, with explicit choice principles. 𝐵 depends on 𝑥 and should be thought of as 𝐵(𝑥). (Contributed by Mario Carneiro, 1-Sep-2015.)
Hypotheses
Ref Expression
iunfo.1 𝑇 = 𝑥𝐴 ({𝑥} × 𝐵)
iundomg.2 (𝜑 𝑥𝐴 (𝐶m 𝐵) ∈ AC 𝐴)
iundomg.3 (𝜑 → ∀𝑥𝐴 𝐵𝐶)
iundomg.4 (𝜑 → (𝐴 × 𝐶) ∈ AC 𝑥𝐴 𝐵)
Assertion
Ref Expression
iundomg (𝜑 𝑥𝐴 𝐵 ≼ (𝐴 × 𝐶))
Distinct variable groups:   𝑥,𝐴   𝑥,𝐶
Allowed substitution hints:   𝜑(𝑥)   𝐵(𝑥)   𝑇(𝑥)

Proof of Theorem iundomg
StepHypRef Expression
1 iunfo.1 . . . . 5 𝑇 = 𝑥𝐴 ({𝑥} × 𝐵)
2 iundomg.2 . . . . 5 (𝜑 𝑥𝐴 (𝐶m 𝐵) ∈ AC 𝐴)
3 iundomg.3 . . . . 5 (𝜑 → ∀𝑥𝐴 𝐵𝐶)
41, 2, 3iundom2g 10462 . . . 4 (𝜑𝑇 ≼ (𝐴 × 𝐶))
5 iundomg.4 . . . 4 (𝜑 → (𝐴 × 𝐶) ∈ AC 𝑥𝐴 𝐵)
6 acndom2 9976 . . . 4 (𝑇 ≼ (𝐴 × 𝐶) → ((𝐴 × 𝐶) ∈ AC 𝑥𝐴 𝐵𝑇AC 𝑥𝐴 𝐵))
74, 5, 6sylc 65 . . 3 (𝜑𝑇AC 𝑥𝐴 𝐵)
81iunfo 10461 . . 3 (2nd𝑇):𝑇onto 𝑥𝐴 𝐵
9 fodomacn 9978 . . 3 (𝑇AC 𝑥𝐴 𝐵 → ((2nd𝑇):𝑇onto 𝑥𝐴 𝐵 𝑥𝐴 𝐵𝑇))
107, 8, 9mpisyl 21 . 2 (𝜑 𝑥𝐴 𝐵𝑇)
11 domtr 8956 . 2 (( 𝑥𝐴 𝐵𝑇𝑇 ≼ (𝐴 × 𝐶)) → 𝑥𝐴 𝐵 ≼ (𝐴 × 𝐶))
1210, 4, 11syl2anc 585 1 (𝜑 𝑥𝐴 𝐵 ≼ (𝐴 × 𝐶))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1542  wcel 2114  wral 3052  {csn 4582   ciun 4948   class class class wbr 5100   × cxp 5630  cres 5634  ontowfo 6498  (class class class)co 7368  2nd c2nd 7942  m cmap 8775  cdom 8893  AC wacn 9862
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-rep 5226  ax-sep 5243  ax-nul 5253  ax-pow 5312  ax-pr 5379  ax-un 7690
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-reu 3353  df-rab 3402  df-v 3444  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4288  df-if 4482  df-pw 4558  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-iun 4950  df-br 5101  df-opab 5163  df-mpt 5182  df-id 5527  df-xp 5638  df-rel 5639  df-cnv 5640  df-co 5641  df-dm 5642  df-rn 5643  df-res 5644  df-ima 5645  df-iota 6456  df-fun 6502  df-fn 6503  df-f 6504  df-f1 6505  df-fo 6506  df-f1o 6507  df-fv 6508  df-ov 7371  df-oprab 7372  df-mpo 7373  df-1st 7943  df-2nd 7944  df-map 8777  df-dom 8897  df-acn 9866
This theorem is referenced by:  iundom  10464  iunctb  10497
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