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Theorem elinlem 44352
Description: Two ways to say a set is a member of an intersection. (Contributed by RP, 19-Aug-2020.)
Assertion
Ref Expression
elinlem (𝐴 ∈ (𝐵𝐶) ↔ (𝐴𝐵 ∧ ( I ‘𝐴) ∈ 𝐶))

Proof of Theorem elinlem
StepHypRef Expression
1 elin 3921 . 2 (𝐴 ∈ (𝐵𝐶) ↔ (𝐴𝐵𝐴𝐶))
2 fvi 6957 . . . . 5 (𝐴𝐵 → ( I ‘𝐴) = 𝐴)
32eqcomd 2769 . . . 4 (𝐴𝐵𝐴 = ( I ‘𝐴))
43eleq1d 2848 . . 3 (𝐴𝐵 → (𝐴𝐶 ↔ ( I ‘𝐴) ∈ 𝐶))
54pm5.32i 584 . 2 ((𝐴𝐵𝐴𝐶) ↔ (𝐴𝐵 ∧ ( I ‘𝐴) ∈ 𝐶))
61, 5bitri 278 1 (𝐴 ∈ (𝐵𝐶) ↔ (𝐴𝐵 ∧ ( I ‘𝐴) ∈ 𝐶))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wb 209  wa 400  wcel 2143  cin 3904   I cid 5555  cfv 6536
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-12 2213  ax-ext 2735  ax-sep 5257  ax-pr 5404
This proof depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4488  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4873  df-br 5110  df-opab 5174  df-id 5556  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-dm 5671  df-iota 6492  df-fun 6538  df-fv 6544
This theorem is used by:  elcnvcnvlem  44353
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