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Theorem elbasov 16539

Description: Utility theorem: reverse closure for any structure defined as a two-argument function. (Contributed by Mario Carneiro, 3-Oct-2015.)

**Hypotheses**
Ref	Expression
elbasov.o	⊢ Rel dom 𝑂
elbasov.s	⊢ 𝑆 = (𝑋𝑂𝑌)
elbasov.b	⊢ 𝐵 = (Base‘𝑆)

**Assertion**
Ref	Expression
elbasov	⊢ (𝐴 ∈ 𝐵 → (𝑋 ∈ V ∧ 𝑌 ∈ V))

**Proof of Theorem elbasov**
Step	Hyp	Ref	Expression
1		n0i 4299	. 2 ⊢ (𝐴 ∈ 𝐵 → ¬ 𝐵 = ∅)
2		elbasov.s	. . . . 5 ⊢ 𝑆 = (𝑋𝑂𝑌)
3		elbasov.o	. . . . . 6 ⊢ Rel dom 𝑂
4	3	ovprc 7188	. . . . 5 ⊢ (¬ (𝑋 ∈ V ∧ 𝑌 ∈ V) → (𝑋𝑂𝑌) = ∅)
5	2, 4	syl5eq 2868	. . . 4 ⊢ (¬ (𝑋 ∈ V ∧ 𝑌 ∈ V) → 𝑆 = ∅)
6	5	fveq2d 6669	. . 3 ⊢ (¬ (𝑋 ∈ V ∧ 𝑌 ∈ V) → (Base‘𝑆) = (Base‘∅))
7		elbasov.b	. . 3 ⊢ 𝐵 = (Base‘𝑆)
8		base0 16530	. . 3 ⊢ ∅ = (Base‘∅)
9	6, 7, 8	3eqtr4g 2881	. 2 ⊢ (¬ (𝑋 ∈ V ∧ 𝑌 ∈ V) → 𝐵 = ∅)
10	1, 9	nsyl2 143	1 ⊢ (𝐴 ∈ 𝐵 → (𝑋 ∈ V ∧ 𝑌 ∈ V))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 398 = wceq 1533 ∈ wcel 2110 Vcvv 3495 ∅c0 4291 dom cdm 5550 Rel wrel 5555 ‘cfv 6350 (class class class)co 7150 Basecbs 16477

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2156 ax-12 2172 ax-ext 2793 ax-sep 5196 ax-nul 5203 ax-pow 5259 ax-pr 5322

This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3497 df-sbc 3773 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4833 df-br 5060 df-opab 5122 df-mpt 5140 df-id 5455 df-xp 5556 df-rel 5557 df-cnv 5558 df-co 5559 df-dm 5560 df-iota 6309 df-fun 6352 df-fv 6358 df-ov 7153 df-slot 16481 df-base 16483

This theorem is referenced by: strov2rcl 16540 psrelbas 20153 psraddcl 20157 psrmulcllem 20161 psrvscafval 20164 psrvscacl 20167 resspsradd 20190 resspsrmul 20191 cphsubrglem 23775 mdegcl 24657

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