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Theorem csbconstgi 34247
Description: The proper substitution of a class for a variable in another variable does not modify it, in inference form. (Contributed by Giovanni Mascellani, 30-May-2019.)
Hypothesis
Ref Expression
csbconstgi.1 𝐴 ∈ V
Assertion
Ref Expression
csbconstgi 𝐴 / 𝑥𝑦 = 𝑦
Distinct variable group:   𝑥,𝑦
Allowed substitution hints:   𝐴(𝑥,𝑦)

Proof of Theorem csbconstgi
StepHypRef Expression
1 csbconstgi.1 . 2 𝐴 ∈ V
2 csbconstg 3693 . 2 (𝐴 ∈ V → 𝐴 / 𝑥𝑦 = 𝑦)
31, 2ax-mp 5 1 𝐴 / 𝑥𝑦 = 𝑦
Colors of variables: wff setvar class
Syntax hints:   = wceq 1630  wcel 2144  Vcvv 3349  csb 3680
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1869  ax-4 1884  ax-5 1990  ax-6 2056  ax-7 2092  ax-9 2153  ax-10 2173  ax-11 2189  ax-12 2202  ax-13 2407  ax-ext 2750
This theorem depends on definitions:  df-bi 197  df-an 383  df-or 827  df-tru 1633  df-ex 1852  df-nf 1857  df-sb 2049  df-clab 2757  df-cleq 2763  df-clel 2766  df-nfc 2901  df-v 3351  df-sbc 3586  df-csb 3681
This theorem is referenced by:  sbccom2lem  34254
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