Theorem xp2nd 6404

Description: Location of the second element of a Cartesian product. (Contributed by Jeff Madsen, 2-Sep-2009.)

Assertion

Ref	Expression
xp2nd	⊢ (𝐴 ∈ (𝐵 × 𝐶) → (2nd ‘𝐴) ∈ 𝐶)

Proof of Theorem xp2nd

Dummy variables 𝑏 𝑐 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		elxp 4793	. 2 ⊢ (𝐴 ∈ (𝐵 × 𝐶) ↔ ∃𝑏∃𝑐(𝐴 = ⟨𝑏, 𝑐⟩ ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐶)))
2		vex 2824	. . . . . . 7 ⊢ 𝑏 ∈ V
3		vex 2824	. . . . . . 7 ⊢ 𝑐 ∈ V
4	2, 3	op2ndd 6387	. . . . . 6 ⊢ (𝐴 = ⟨𝑏, 𝑐⟩ → (2nd ‘𝐴) = 𝑐)
5	4	eleq1d 2307	. . . . 5 ⊢ (𝐴 = ⟨𝑏, 𝑐⟩ → ((2nd ‘𝐴) ∈ 𝐶 ↔ 𝑐 ∈ 𝐶))
6	5	biimpar 297	. . . 4 ⊢ ((𝐴 = ⟨𝑏, 𝑐⟩ ∧ 𝑐 ∈ 𝐶) → (2nd ‘𝐴) ∈ 𝐶)
7	6	adantrl 482	. . 3 ⊢ ((𝐴 = ⟨𝑏, 𝑐⟩ ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐶)) → (2nd ‘𝐴) ∈ 𝐶)
8	7	exlimivv 1952	. 2 ⊢ (∃𝑏∃𝑐(𝐴 = ⟨𝑏, 𝑐⟩ ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐶)) → (2nd ‘𝐴) ∈ 𝐶)
9	1, 8	sylbi 121	1 ⊢ (𝐴 ∈ (𝐵 × 𝐶) → (2nd ‘𝐴) ∈ 𝐶)

This proof depends on syntax axioms:   → wi 4   ∧ wa 104   = wceq 1402  ∃wex 1545   ∈ wcel 2209  ⟨cop 3712   × cxp 4774  ‘cfv 5380  2^nd c2nd 6377

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4251  ax-pow 4313  ax-pr 4348  ax-un 4580

This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-br 4132  df-opab 4194  df-mpt 4195  df-id 4440  df-xp 4782  df-rel 4783  df-cnv 4784  df-co 4785  df-dm 4786  df-rn 4787  df-iota 5340  df-fun 5382  df-fv 5388  df-2nd 6379

This theorem is used by:  xpf1o  7149  xpmapenlem  7154  mapunen  7156  opabfi  7252  djuf1olem  7400  exmidapne  7633  cc2lem  7639  dfplpq2  7728  dfmpq2  7729  enqbreq2  7731  enqdc1  7736  mulpipq2  7745  preqlu  7846  elnp1st2nd  7850  cauappcvgprlemladd  8032  elreal2  8204  cnref1o  10069  frecuzrdgrrn  10867  frec2uzrdg  10868  frecuzrdgrcl  10869  frecuzrdgtcl  10871  frecuzrdgsuc  10873  frecuzrdgrclt  10874  frecuzrdgg  10875  frecuzrdgdomlem  10876  frecuzrdgfunlem  10878  frecuzrdgsuctlem  10882  seq3val  10919  seqvalcd  10920  fisumcom2  12231  fprodcom2fi  12419  eucalgval  12858  eucalginv  12860  eucalglt  12861  eucalgcvga  12862  eucalg  12863  sqpweven  12981  2sqpwodd  12982  ctiunctlemudc  13387  xpsff1o  13730  gsum2dfilem2  14273  tx1cn  15507  txdis  15515  txhmeo  15557  xmetxp  15745  xmetxpbl  15746  xmettxlem  15747  xmettx  15748  idjudju  17264