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Theorem ralbii2 2377
Description: Inference adding different restricted universal quantifiers to each side of an equivalence. (Contributed by NM, 15-Aug-2005.)
Hypothesis
Ref Expression
ralbii2.1 ((𝑥𝐴𝜑) ↔ (𝑥𝐵𝜓))
Assertion
Ref Expression
ralbii2 (∀𝑥𝐴 𝜑 ↔ ∀𝑥𝐵 𝜓)

Proof of Theorem ralbii2
StepHypRef Expression
1 ralbii2.1 . . 3 ((𝑥𝐴𝜑) ↔ (𝑥𝐵𝜓))
21albii 1400 . 2 (∀𝑥(𝑥𝐴𝜑) ↔ ∀𝑥(𝑥𝐵𝜓))
3 df-ral 2354 . 2 (∀𝑥𝐴 𝜑 ↔ ∀𝑥(𝑥𝐴𝜑))
4 df-ral 2354 . 2 (∀𝑥𝐵 𝜓 ↔ ∀𝑥(𝑥𝐵𝜓))
52, 3, 43bitr4i 210 1 (∀𝑥𝐴 𝜑 ↔ ∀𝑥𝐵 𝜓)
Colors of variables: wff set class
Syntax hints:  wi 4  wb 103  wal 1283  wcel 1434  wral 2349
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-5 1377  ax-gen 1379
This theorem depends on definitions:  df-bi 115  df-ral 2354
This theorem is referenced by:  raleqbii  2379  ralbiia  2381  ralrab  2754  raldifb  3113  raluz2  8737  ralrp  8825  isprm4  10634
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