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Theorem extssr 39614
Description: Property of subset relation, see also extid 39341, extep 39314 and the comment of df-ssr 39603. (Contributed by Peter Mazsa, 10-Jul-2019.)
Assertion
Ref Expression
extssr ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ([𝐴]◡ S = [𝐵]◡ S ↔ 𝐴 = 𝐵))

Proof of Theorem extssr
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 brssr 39606 . . . 4 (𝐴 ∈ 𝑉 → (𝑥 S 𝐴 ↔ 𝑥 ⊆ 𝐴))
2 brssr 39606 . . . 4 (𝐵 ∈ 𝑊 → (𝑥 S 𝐵 ↔ 𝑥 ⊆ 𝐵))
31, 2bi2bian9 652 . . 3 ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ((𝑥 S 𝐴 ↔ 𝑥 S 𝐵) ↔ (𝑥 ⊆ 𝐴 ↔ 𝑥 ⊆ 𝐵)))
43albidv 1952 . 2 ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (∀𝑥(𝑥 S 𝐴 ↔ 𝑥 S 𝐵) ↔ ∀𝑥(𝑥 ⊆ 𝐴 ↔ 𝑥 ⊆ 𝐵)))
5 relssr 39605 . . 3 Rel S
6 releccnveq 39286 . . 3 ((Rel S ∧ Rel S ) → ([𝐴]◡ S = [𝐵]◡ S ↔ ∀𝑥(𝑥 S 𝐴 ↔ 𝑥 S 𝐵)))
75, 5, 6mp2an 705 . 2 ([𝐴]◡ S = [𝐵]◡ S ↔ ∀𝑥(𝑥 S 𝐴 ↔ 𝑥 S 𝐵))
8 ssext 5421 . 2 (𝐴 = 𝐵 ↔ ∀𝑥(𝑥 ⊆ 𝐴 ↔ 𝑥 ⊆ 𝐵))
94, 7, 83bitr4g 317 1 ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ([𝐴]◡ S = [𝐵]◡ S ↔ 𝐴 = 𝐵))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ↔ wb 209   ∧ wa 401  ∀wal 1567   = wceq 1569   ∈ wcel 2144   ⊆ wss 3895   class class class wbr 5102  ◡ccnv 5649  Rel wrel 5655  [cec 8718   S cssr 39211
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-ext 2732  ax-sep 5248  ax-pr 5390
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2099  df-clab 2739  df-cleq 2752  df-clel 2835  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-pw 4558  df-sn 4585  df-pr 4587  df-op 4835  df-br 5103  df-opab 5167  df-xp 5656  df-rel 5657  df-cnv 5658  df-dm 5660  df-rn 5661  df-res 5662  df-ima 5663  df-ec 8722  df-ssr 39603
This theorem is used by: (None)
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