Theorem cnvexg 4875

Description: The converse of a set is a set. Corollary 6.8(1) of [TakeutiZaring] p. 26. (Contributed by NM, 17-Mar-1998.)

Assertion

Ref	Expression
cnvexg	⊢ (𝐴 ∈ 𝑉 → ◡𝐴 ∈ V)

Proof of Theorem cnvexg

Step	Hyp	Ref	Expression
1		relcnv 4723	. . 3 ⊢ Rel ◡𝐴
2		relssdmrn 4861	. . 3 ⊢ (Rel ◡𝐴 → ◡𝐴 ⊆ (dom ◡𝐴 × ran ◡𝐴))
3	1, 2	ax-mp 7	. 2 ⊢ ◡𝐴 ⊆ (dom ◡𝐴 × ran ◡𝐴)
4		df-rn 4374	. . . 4 ⊢ ran 𝐴 = dom ◡𝐴
5		rnexg 4615	. . . 4 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V)
6	4, 5	syl5eqelr 2166	. . 3 ⊢ (𝐴 ∈ 𝑉 → dom ◡𝐴 ∈ V)
7		dfdm4 4545	. . . 4 ⊢ dom 𝐴 = ran ◡𝐴
8		dmexg 4614	. . . 4 ⊢ (𝐴 ∈ 𝑉 → dom 𝐴 ∈ V)
9	7, 8	syl5eqelr 2166	. . 3 ⊢ (𝐴 ∈ 𝑉 → ran ◡𝐴 ∈ V)
10		xpexg 4470	. . 3 ⊢ ((dom ◡𝐴 ∈ V ∧ ran ◡𝐴 ∈ V) → (dom ◡𝐴 × ran ◡𝐴) ∈ V)
11	6, 9, 10	syl2anc 403	. 2 ⊢ (𝐴 ∈ 𝑉 → (dom ◡𝐴 × ran ◡𝐴) ∈ V)
12		ssexg 3917	. 2 ⊢ ((◡𝐴 ⊆ (dom ◡𝐴 × ran ◡𝐴) ∧ (dom ◡𝐴 × ran ◡𝐴) ∈ V) → ◡𝐴 ∈ V)
13	3, 11, 12	sylancr 405	1 ⊢ (𝐴 ∈ 𝑉 → ◡𝐴 ∈ V)

Syntax hints:   → wi 4   ∈ wcel 1433  Vcvv 2601   ⊆ wss 2973   × cxp 4361  ^◡ccnv 4362  dom cdm 4363  ran crn 4364  Rel wrel 4368

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-13 1444  ax-14 1445  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063  ax-sep 3896  ax-pow 3948  ax-pr 3964  ax-un 4188

This theorem depends on definitions:  df-bi 115  df-3an 921  df-tru 1287  df-nf 1390  df-sb 1686  df-eu 1944  df-mo 1945  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-ral 2353  df-rex 2354  df-v 2603  df-un 2977  df-in 2979  df-ss 2986  df-pw 3384  df-sn 3404  df-pr 3405  df-op 3407  df-uni 3602  df-br 3786  df-opab 3840  df-xp 4369  df-rel 4370  df-cnv 4371  df-dm 4373  df-rn 4374

This theorem is referenced by:  cnvex  4876  relcnvexb  4877  cofunex2g  5759  cnvf1o  5866  brtpos2  5889  tposexg  5896  cnven  6311  fopwdom  6333  relcnvfi  6391