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Theorem csbeq1d 2886
 Description: Equality deduction for proper substitution into a class. (Contributed by NM, 3-Dec-2005.)
Hypothesis
Ref Expression
csbeq1d.1 (𝜑𝐴 = 𝐵)
Assertion
Ref Expression
csbeq1d (𝜑𝐴 / 𝑥𝐶 = 𝐵 / 𝑥𝐶)

Proof of Theorem csbeq1d
StepHypRef Expression
1 csbeq1d.1 . 2 (𝜑𝐴 = 𝐵)
2 csbeq1 2883 . 2 (𝐴 = 𝐵𝐴 / 𝑥𝐶 = 𝐵 / 𝑥𝐶)
31, 2syl 14 1 (𝜑𝐴 / 𝑥𝐶 = 𝐵 / 𝑥𝐶)
 Colors of variables: wff set class Syntax hints:   → wi 4   = wceq 1259  ⦋csb 2880 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 103  ax-ia2 104  ax-ia3 105  ax-5 1352  ax-7 1353  ax-gen 1354  ax-ie1 1398  ax-ie2 1399  ax-8 1411  ax-11 1413  ax-4 1416  ax-17 1435  ax-i9 1439  ax-ial 1443  ax-i5r 1444  ax-ext 2038 This theorem depends on definitions:  df-bi 114  df-tru 1262  df-nf 1366  df-sb 1662  df-clab 2043  df-cleq 2049  df-clel 2052  df-sbc 2788  df-csb 2881 This theorem is referenced by:  csbidmg  2930  csbco3g  2932  fmptcof  5359  mpt2mptsx  5851  dmmpt2ssx  5853  fmpt2x  5854  fmpt2co  5865
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