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Theorem elbasov 16537

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 4249	. 2 ⊢ (𝐴 ∈ 𝐵 → ¬ 𝐵 = ∅)
2		elbasov.s	. . . . 5 ⊢ 𝑆 = (𝑋𝑂𝑌)
3		elbasov.o	. . . . . 6 ⊢ Rel dom 𝑂
4	3	ovprc 7173	. . . . 5 ⊢ (¬ (𝑋 ∈ V ∧ 𝑌 ∈ V) → (𝑋𝑂𝑌) = ∅)
5	2, 4	syl5eq 2845	. . . 4 ⊢ (¬ (𝑋 ∈ V ∧ 𝑌 ∈ V) → 𝑆 = ∅)
6	5	fveq2d 6649	. . 3 ⊢ (¬ (𝑋 ∈ V ∧ 𝑌 ∈ V) → (Base‘𝑆) = (Base‘∅))
7		elbasov.b	. . 3 ⊢ 𝐵 = (Base‘𝑆)
8		base0 16528	. . 3 ⊢ ∅ = (Base‘∅)
9	6, 7, 8	3eqtr4g 2858	. 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 399 = wceq 1538 ∈ wcel 2111 Vcvv 3441 ∅c0 4243 dom cdm 5519 Rel wrel 5524 ‘cfv 6324 (class class class)co 7135 Basecbs 16475

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pow 5231 ax-pr 5295

This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ral 3111 df-rex 3112 df-v 3443 df-sbc 3721 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-if 4426 df-sn 4526 df-pr 4528 df-op 4532 df-uni 4801 df-br 5031 df-opab 5093 df-mpt 5111 df-id 5425 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-iota 6283 df-fun 6326 df-fv 6332 df-ov 7138 df-slot 16479 df-base 16481

This theorem is referenced by: strov2rcl 16538 psrelbas 20617 psraddcl 20621 psrmulcllem 20625 psrvscafval 20628 psrvscacl 20631 resspsradd 20654 resspsrmul 20655 cphsubrglem 23782 mdegcl 24670

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