Theorem rspceeqv 2948

Description: Restricted existential specialization in an equality, using implicit substitution. (Contributed by BJ, 2-Sep-2022.)

Hypothesis

Ref	Expression
rspceeqv.1	⊢ (𝑥 = 𝐴 → 𝐶 = 𝐷)

Assertion

Ref	Expression
rspceeqv	⊢ ((𝐴 ∈ 𝐵 ∧ 𝐸 = 𝐷) → ∃𝑥 ∈ 𝐵 𝐸 = 𝐶)

Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑥,𝐷   𝑥,𝐸

Allowed substitution hint:   𝐶(𝑥)

Proof of Theorem rspceeqv

Step	Hyp	Ref	Expression
1		rspceeqv.1	. . 3 ⊢ (𝑥 = 𝐴 → 𝐶 = 𝐷)
2	1	eqeq2d 2250	. 2 ⊢ (𝑥 = 𝐴 → (𝐸 = 𝐶 ↔ 𝐸 = 𝐷))
3	2	rspcev 2929	1 ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐸 = 𝐷) → ∃𝑥 ∈ 𝐵 𝐸 = 𝐶)

Syntax hints:   → wi 4   ∧ wa 104   = wceq 1402   ∈ wcel 2209  ∃wrex 2529

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 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-ext 2220

This theorem depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-rex 2534  df-v 2823

This theorem is referenced by:  elixpsn  7007  ixpsnf1o  7008  elfir  7297  0ct  7437  ctmlemr  7438  ctssdclemn0  7440  fodju0  7477  ccats1pfxeqrex  11465  mertenslemi1  12280  mertenslem2  12281  nninfctlemfo  12795  pcprmpw  13091  1arithlem4  13123  ctiunctlemfo  13308  elrestr  13578  lss1d  14692  lspsn  14725  znf1o  14958  restopnb  15205  mopnex  15529  metrest  15530  mpodvdsmulf1o  16018  lgsquadlem1  16110  2sqlem2  16148  mul2sq  16149  2sqlem3  16150  2sqlem9  16157  2sqlem10  16158  nnnninfex  16970