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Theorem sborv 1844
 Description: Version of sbor 1903 where 𝑥 and 𝑦 are distinct. (Contributed by Jim Kingdon, 3-Feb-2018.)
Assertion
Ref Expression
sborv ([𝑦 / 𝑥](𝜑𝜓) ↔ ([𝑦 / 𝑥]𝜑 ∨ [𝑦 / 𝑥]𝜓))
Distinct variable group:   𝑥,𝑦
Allowed substitution hints:   𝜑(𝑥,𝑦)   𝜓(𝑥,𝑦)

Proof of Theorem sborv
StepHypRef Expression
1 sb5 1841 . . 3 ([𝑦 / 𝑥](𝜑𝜓) ↔ ∃𝑥(𝑥 = 𝑦 ∧ (𝜑𝜓)))
2 andi 790 . . . 4 ((𝑥 = 𝑦 ∧ (𝜑𝜓)) ↔ ((𝑥 = 𝑦𝜑) ∨ (𝑥 = 𝑦𝜓)))
32exbii 1567 . . 3 (∃𝑥(𝑥 = 𝑦 ∧ (𝜑𝜓)) ↔ ∃𝑥((𝑥 = 𝑦𝜑) ∨ (𝑥 = 𝑦𝜓)))
4 19.43 1590 . . 3 (∃𝑥((𝑥 = 𝑦𝜑) ∨ (𝑥 = 𝑦𝜓)) ↔ (∃𝑥(𝑥 = 𝑦𝜑) ∨ ∃𝑥(𝑥 = 𝑦𝜓)))
51, 3, 43bitri 205 . 2 ([𝑦 / 𝑥](𝜑𝜓) ↔ (∃𝑥(𝑥 = 𝑦𝜑) ∨ ∃𝑥(𝑥 = 𝑦𝜓)))
6 sb5 1841 . . 3 ([𝑦 / 𝑥]𝜑 ↔ ∃𝑥(𝑥 = 𝑦𝜑))
7 sb5 1841 . . 3 ([𝑦 / 𝑥]𝜓 ↔ ∃𝑥(𝑥 = 𝑦𝜓))
86, 7orbi12i 736 . 2 (([𝑦 / 𝑥]𝜑 ∨ [𝑦 / 𝑥]𝜓) ↔ (∃𝑥(𝑥 = 𝑦𝜑) ∨ ∃𝑥(𝑥 = 𝑦𝜓)))
95, 8bitr4i 186 1 ([𝑦 / 𝑥](𝜑𝜓) ↔ ([𝑦 / 𝑥]𝜑 ∨ [𝑦 / 𝑥]𝜓))
 Colors of variables: wff set class Syntax hints:   ∧ wa 103   ↔ wb 104   ∨ wo 680  ∃wex 1451  [wsb 1718 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 681  ax-5 1406  ax-gen 1408  ax-ie1 1452  ax-ie2 1453  ax-8 1465  ax-11 1467  ax-4 1470  ax-17 1489  ax-i9 1493  ax-ial 1497 This theorem depends on definitions:  df-bi 116  df-sb 1719 This theorem is referenced by:  sbor  1903
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