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Theorem bnj953 32204
 Description: Technical lemma for bnj69 32275. This lemma may no longer be used or have become an indirect lemma of the theorem in question (i.e. a lemma of a lemma... of the theorem). (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.)
Hypotheses
Ref Expression
bnj953.1 (𝜓 ↔ ∀𝑖 ∈ ω (suc 𝑖𝑛 → (𝑓‘suc 𝑖) = 𝑦 ∈ (𝑓𝑖) pred(𝑦, 𝐴, 𝑅)))
bnj953.2 ((𝐺𝑖) = (𝑓𝑖) → ∀𝑦(𝐺𝑖) = (𝑓𝑖))
Assertion
Ref Expression
bnj953 (((𝐺𝑖) = (𝑓𝑖) ∧ (𝐺‘suc 𝑖) = (𝑓‘suc 𝑖) ∧ (𝑖 ∈ ω ∧ suc 𝑖𝑛) ∧ 𝜓) → (𝐺‘suc 𝑖) = 𝑦 ∈ (𝐺𝑖) pred(𝑦, 𝐴, 𝑅))

Proof of Theorem bnj953
StepHypRef Expression
1 bnj312 31975 . . 3 (((𝐺𝑖) = (𝑓𝑖) ∧ (𝐺‘suc 𝑖) = (𝑓‘suc 𝑖) ∧ (𝑖 ∈ ω ∧ suc 𝑖𝑛) ∧ 𝜓) ↔ ((𝐺‘suc 𝑖) = (𝑓‘suc 𝑖) ∧ (𝐺𝑖) = (𝑓𝑖) ∧ (𝑖 ∈ ω ∧ suc 𝑖𝑛) ∧ 𝜓))
2 bnj251 31965 . . 3 (((𝐺‘suc 𝑖) = (𝑓‘suc 𝑖) ∧ (𝐺𝑖) = (𝑓𝑖) ∧ (𝑖 ∈ ω ∧ suc 𝑖𝑛) ∧ 𝜓) ↔ ((𝐺‘suc 𝑖) = (𝑓‘suc 𝑖) ∧ ((𝐺𝑖) = (𝑓𝑖) ∧ ((𝑖 ∈ ω ∧ suc 𝑖𝑛) ∧ 𝜓))))
31, 2bitri 277 . 2 (((𝐺𝑖) = (𝑓𝑖) ∧ (𝐺‘suc 𝑖) = (𝑓‘suc 𝑖) ∧ (𝑖 ∈ ω ∧ suc 𝑖𝑛) ∧ 𝜓) ↔ ((𝐺‘suc 𝑖) = (𝑓‘suc 𝑖) ∧ ((𝐺𝑖) = (𝑓𝑖) ∧ ((𝑖 ∈ ω ∧ suc 𝑖𝑛) ∧ 𝜓))))
4 bnj953.1 . . . . . 6 (𝜓 ↔ ∀𝑖 ∈ ω (suc 𝑖𝑛 → (𝑓‘suc 𝑖) = 𝑦 ∈ (𝑓𝑖) pred(𝑦, 𝐴, 𝑅)))
54bnj115 31988 . . . . 5 (𝜓 ↔ ∀𝑖((𝑖 ∈ ω ∧ suc 𝑖𝑛) → (𝑓‘suc 𝑖) = 𝑦 ∈ (𝑓𝑖) pred(𝑦, 𝐴, 𝑅)))
6 sp 2175 . . . . . 6 (∀𝑖((𝑖 ∈ ω ∧ suc 𝑖𝑛) → (𝑓‘suc 𝑖) = 𝑦 ∈ (𝑓𝑖) pred(𝑦, 𝐴, 𝑅)) → ((𝑖 ∈ ω ∧ suc 𝑖𝑛) → (𝑓‘suc 𝑖) = 𝑦 ∈ (𝑓𝑖) pred(𝑦, 𝐴, 𝑅)))
76impcom 410 . . . . 5 (((𝑖 ∈ ω ∧ suc 𝑖𝑛) ∧ ∀𝑖((𝑖 ∈ ω ∧ suc 𝑖𝑛) → (𝑓‘suc 𝑖) = 𝑦 ∈ (𝑓𝑖) pred(𝑦, 𝐴, 𝑅))) → (𝑓‘suc 𝑖) = 𝑦 ∈ (𝑓𝑖) pred(𝑦, 𝐴, 𝑅))
85, 7sylan2b 595 . . . 4 (((𝑖 ∈ ω ∧ suc 𝑖𝑛) ∧ 𝜓) → (𝑓‘suc 𝑖) = 𝑦 ∈ (𝑓𝑖) pred(𝑦, 𝐴, 𝑅))
9 bnj953.2 . . . . 5 ((𝐺𝑖) = (𝑓𝑖) → ∀𝑦(𝐺𝑖) = (𝑓𝑖))
109bnj956 32041 . . . 4 ((𝐺𝑖) = (𝑓𝑖) → 𝑦 ∈ (𝐺𝑖) pred(𝑦, 𝐴, 𝑅) = 𝑦 ∈ (𝑓𝑖) pred(𝑦, 𝐴, 𝑅))
11 eqtr3 2841 . . . 4 (((𝑓‘suc 𝑖) = 𝑦 ∈ (𝑓𝑖) pred(𝑦, 𝐴, 𝑅) ∧ 𝑦 ∈ (𝐺𝑖) pred(𝑦, 𝐴, 𝑅) = 𝑦 ∈ (𝑓𝑖) pred(𝑦, 𝐴, 𝑅)) → (𝑓‘suc 𝑖) = 𝑦 ∈ (𝐺𝑖) pred(𝑦, 𝐴, 𝑅))
128, 10, 11syl2anr 598 . . 3 (((𝐺𝑖) = (𝑓𝑖) ∧ ((𝑖 ∈ ω ∧ suc 𝑖𝑛) ∧ 𝜓)) → (𝑓‘suc 𝑖) = 𝑦 ∈ (𝐺𝑖) pred(𝑦, 𝐴, 𝑅))
13 eqtr 2839 . . 3 (((𝐺‘suc 𝑖) = (𝑓‘suc 𝑖) ∧ (𝑓‘suc 𝑖) = 𝑦 ∈ (𝐺𝑖) pred(𝑦, 𝐴, 𝑅)) → (𝐺‘suc 𝑖) = 𝑦 ∈ (𝐺𝑖) pred(𝑦, 𝐴, 𝑅))
1412, 13sylan2 594 . 2 (((𝐺‘suc 𝑖) = (𝑓‘suc 𝑖) ∧ ((𝐺𝑖) = (𝑓𝑖) ∧ ((𝑖 ∈ ω ∧ suc 𝑖𝑛) ∧ 𝜓))) → (𝐺‘suc 𝑖) = 𝑦 ∈ (𝐺𝑖) pred(𝑦, 𝐴, 𝑅))
153, 14sylbi 219 1 (((𝐺𝑖) = (𝑓𝑖) ∧ (𝐺‘suc 𝑖) = (𝑓‘suc 𝑖) ∧ (𝑖 ∈ ω ∧ suc 𝑖𝑛) ∧ 𝜓) → (𝐺‘suc 𝑖) = 𝑦 ∈ (𝐺𝑖) pred(𝑦, 𝐴, 𝑅))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 398  ∀wal 1529   = wceq 1531   ∈ wcel 2108  ∀wral 3136  ∪ ciun 4910  suc csuc 6186  ‘cfv 6348  ωcom 7572   ∧ w-bnj17 31949   predc-bnj14 31951 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1905  ax-6 1964  ax-7 2009  ax-8 2110  ax-9 2118  ax-12 2170  ax-ext 2791 This theorem depends on definitions:  df-bi 209  df-an 399  df-3an 1084  df-ex 1775  df-sb 2064  df-clab 2798  df-cleq 2812  df-clel 2891  df-ral 3141  df-rex 3142  df-iun 4912  df-bnj17 31950 This theorem is referenced by:  bnj967  32210
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