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Theorem extssr 39489
Description: Property of subset relation, see also extid 39216, extep 39189 and the comment of df-ssr 39478. (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 39481 . . . 4 (𝐴 ∈ 𝑉 → (𝑥 S 𝐴 ↔ 𝑥 ⊆ 𝐴))
2 brssr 39481 . . . 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 1953 . 2 ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (∀𝑥(𝑥 S 𝐴 ↔ 𝑥 S 𝐵) ↔ ∀𝑥(𝑥 ⊆ 𝐴 ↔ 𝑥 ⊆ 𝐵)))
5 relssr 39480 . . 3 Rel S
6 releccnveq 39161 . . 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 5422 . 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 1568   = wceq 1570   ∈ wcel 2145   ⊆ wss 3899   class class class wbr 5103  ◡ccnv 5650  Rel wrel 5656  [cec 8699   S cssr 39086
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2733  ax-sep 5249  ax-pr 5391
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2740  df-cleq 2753  df-clel 2836  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-br 5104  df-opab 5168  df-xp 5657  df-rel 5658  df-cnv 5659  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-ec 8703  df-ssr 39478
This theorem is used by: (None)
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