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Theorem vjust 3479
Description: Justification theorem for df-v 3480. (Contributed by Rodolfo Medina, 27-Apr-2010.)
Assertion
Ref Expression
vjust {𝑥𝑥 = 𝑥} = {𝑦𝑦 = 𝑦}

Proof of Theorem vjust
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 equid 2009 . . . 4 𝑥 = 𝑥
21vexw 2718 . . 3 𝑧 ∈ {𝑥𝑥 = 𝑥}
3 equid 2009 . . . 4 𝑦 = 𝑦
43vexw 2718 . . 3 𝑧 ∈ {𝑦𝑦 = 𝑦}
52, 42th 264 . 2 (𝑧 ∈ {𝑥𝑥 = 𝑥} ↔ 𝑧 ∈ {𝑦𝑦 = 𝑦})
65eqriv 2732 1 {𝑥𝑥 = 𝑥} = {𝑦𝑦 = 𝑦}
Colors of variables: wff setvar class
Syntax hints:   = wceq 1537  wcel 2106  {cab 2712
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 1908  ax-6 1965  ax-7 2005  ax-9 2116  ax-ext 2706
This theorem depends on definitions:  df-bi 207  df-an 396  df-ex 1777  df-sb 2063  df-clab 2713  df-cleq 2727
This theorem is referenced by: (None)
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