Theorem cbvixpv 8473

Description: Change bound variable in an indexed Cartesian product. (Contributed by Jeff Madsen, 2-Sep-2009.)

Hypothesis

Ref	Expression
cbvixpv.1	⊢ (𝑥 = 𝑦 → 𝐵 = 𝐶)

Assertion

Ref	Expression
cbvixpv	⊢ X𝑥 ∈ 𝐴 𝐵 = X𝑦 ∈ 𝐴 𝐶

Distinct variable groups:   𝑥,𝐴,𝑦   𝑦,𝐵   𝑥,𝐶

Allowed substitution hints:   𝐵(𝑥)   𝐶(𝑦)

Proof of Theorem cbvixpv

Step	Hyp	Ref	Expression
1		nfcv 2977	. 2 ⊢ Ⅎ𝑦𝐵
2		nfcv 2977	. 2 ⊢ Ⅎ𝑥𝐶
3		cbvixpv.1	. 2 ⊢ (𝑥 = 𝑦 → 𝐵 = 𝐶)
4	1, 2, 3	cbvixp 8472	1 ⊢ X𝑥 ∈ 𝐴 𝐵 = X𝑦 ∈ 𝐴 𝐶

Syntax hints:   → wi 4   = wceq 1533  Xcixp 8455

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 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-nul 4291  df-if 4467  df-sn 4561  df-pr 4563  df-op 4567  df-uni 4832  df-br 5059  df-iota 6308  df-fn 6352  df-fv 6357  df-ixp 8456

This theorem is referenced by:  funcpropd  17164  invfuc  17238  natpropd  17240  dprdw  19126  dprdwd  19127  ptuni2  22178  ptbasin  22179  ptbasfi  22183  ptpjopn  22214  ptclsg  22217  dfac14  22220  ptcnp  22224  ptcmplem2  22655  ptcmpg  22659  prdsxmslem2  23133  upixp  34998  rrxsnicc  42579  ioorrnopn  42584  ioorrnopnxr  42586  ovnsubadd  42848  hoidmvlelem4  42874  hoidmvle  42876  hspdifhsp  42892  hoiqssbllem2  42899  hspmbl  42905  hoimbl  42907  opnvonmbl  42910  ovnovollem3  42934