Theorem xp2nd 6170

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 4645	. 2 ⊢ (𝐴 ∈ (𝐵 × 𝐶) ↔ ∃𝑏∃𝑐(𝐴 = ⟨𝑏, 𝑐⟩ ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐶)))
2		vex 2742	. . . . . . 7 ⊢ 𝑏 ∈ V
3		vex 2742	. . . . . . 7 ⊢ 𝑐 ∈ V
4	2, 3	op2ndd 6153	. . . . . 6 ⊢ (𝐴 = ⟨𝑏, 𝑐⟩ → (2nd ‘𝐴) = 𝑐)
5	4	eleq1d 2246	. . . . 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 478	. . 3 ⊢ ((𝐴 = ⟨𝑏, 𝑐⟩ ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐶)) → (2nd ‘𝐴) ∈ 𝐶)
8	7	exlimivv 1896	. 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)

Syntax hints:   → wi 4   ∧ wa 104   = wceq 1353  ∃wex 1492   ∈ wcel 2148  ⟨cop 3597   × cxp 4626  ‘cfv 5218  2^nd c2nd 6143

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-sep 4123  ax-pow 4176  ax-pr 4211  ax-un 4435

This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ral 2460  df-rex 2461  df-v 2741  df-sbc 2965  df-un 3135  df-in 3137  df-ss 3144  df-pw 3579  df-sn 3600  df-pr 3601  df-op 3603  df-uni 3812  df-br 4006  df-opab 4067  df-mpt 4068  df-id 4295  df-xp 4634  df-rel 4635  df-cnv 4636  df-co 4637  df-dm 4638  df-rn 4639  df-iota 5180  df-fun 5220  df-fv 5226  df-2nd 6145

This theorem is referenced by:  xpf1o  6847  xpmapenlem  6852  djuf1olem  7055  exmidapne  7262  cc2lem  7268  dfplpq2  7356  dfmpq2  7357  enqbreq2  7359  enqdc1  7364  mulpipq2  7373  preqlu  7474  elnp1st2nd  7478  cauappcvgprlemladd  7660  elreal2  7832  cnref1o  9653  frecuzrdgrrn  10411  frec2uzrdg  10412  frecuzrdgrcl  10413  frecuzrdgtcl  10415  frecuzrdgsuc  10417  frecuzrdgrclt  10418  frecuzrdgg  10419  frecuzrdgdomlem  10420  frecuzrdgfunlem  10422  frecuzrdgsuctlem  10426  seq3val  10461  seqvalcd  10462  fisumcom2  11449  fprodcom2fi  11637  eucalgval  12057  eucalginv  12059  eucalglt  12060  eucalgcvga  12061  eucalg  12062  sqpweven  12178  2sqpwodd  12179  ctiunctlemudc  12441  xpsff1o  12775  tx1cn  13930  txdis  13938  txhmeo  13980  xmetxp  14168  xmetxpbl  14169  xmettxlem  14170  xmettx  14171