Theorem cnvexg 5141

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 4982	. . 3 ⊢ Rel ◡𝐴
2		relssdmrn 5124	. . 3 ⊢ (Rel ◡𝐴 → ◡𝐴 ⊆ (dom ◡𝐴 × ran ◡𝐴))
3	1, 2	ax-mp 5	. 2 ⊢ ◡𝐴 ⊆ (dom ◡𝐴 × ran ◡𝐴)
4		df-rn 4615	. . . 4 ⊢ ran 𝐴 = dom ◡𝐴
5		rnexg 4869	. . . 4 ⊢ (𝐴 ∈ 𝑉 → ran 𝐴 ∈ V)
6	4, 5	eqeltrrid 2254	. . 3 ⊢ (𝐴 ∈ 𝑉 → dom ◡𝐴 ∈ V)
7		dfdm4 4796	. . . 4 ⊢ dom 𝐴 = ran ◡𝐴
8		dmexg 4868	. . . 4 ⊢ (𝐴 ∈ 𝑉 → dom 𝐴 ∈ V)
9	7, 8	eqeltrrid 2254	. . 3 ⊢ (𝐴 ∈ 𝑉 → ran ◡𝐴 ∈ V)
10		xpexg 4718	. . 3 ⊢ ((dom ◡𝐴 ∈ V ∧ ran ◡𝐴 ∈ V) → (dom ◡𝐴 × ran ◡𝐴) ∈ V)
11	6, 9, 10	syl2anc 409	. 2 ⊢ (𝐴 ∈ 𝑉 → (dom ◡𝐴 × ran ◡𝐴) ∈ V)
12		ssexg 4121	. 2 ⊢ ((◡𝐴 ⊆ (dom ◡𝐴 × ran ◡𝐴) ∧ (dom ◡𝐴 × ran ◡𝐴) ∈ V) → ◡𝐴 ∈ V)
13	3, 11, 12	sylancr 411	1 ⊢ (𝐴 ∈ 𝑉 → ◡𝐴 ∈ V)

Syntax hints:   → wi 4   ∈ wcel 2136  Vcvv 2726   ⊆ wss 3116   × cxp 4602  ^◡ccnv 4603  dom cdm 4604  ran crn 4605  Rel wrel 4609

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-sep 4100  ax-pow 4153  ax-pr 4187  ax-un 4411

This theorem depends on definitions:  df-bi 116  df-3an 970  df-tru 1346  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ral 2449  df-rex 2450  df-v 2728  df-un 3120  df-in 3122  df-ss 3129  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-br 3983  df-opab 4044  df-xp 4610  df-rel 4611  df-cnv 4612  df-dm 4614  df-rn 4615

This theorem is referenced by:  cnvex  5142  relcnvexb  5143  cofunex2g  6078  cnvf1o  6193  brtpos2  6219  tposexg  6226  cnven  6774  cnvct  6775  fopwdom  6802  relcnvfi  6906  ennnfonelemim  12357  pw1nct  13883