Theorem brrelexi 4384

Description: The first argument of a binary relation exists. (An artifact of our ordered pair definition.) (Contributed by NM, 4-Jun-1998.)

Hypothesis

Ref	Expression
brrelexi.1	⊢ Rel 𝑅

Assertion

Ref	Expression
brrelexi	⊢ (𝐴𝑅𝐵 → 𝐴 ∈ V)

Proof of Theorem brrelexi

Step	Hyp	Ref	Expression
1		brrelexi.1	. 2 ⊢ Rel 𝑅
2		brrelex 4382	. 2 ⊢ ((Rel 𝑅 ∧ 𝐴𝑅𝐵) → 𝐴 ∈ V)
3	1, 2	mpan 400	1 ⊢ (𝐴𝑅𝐵 → 𝐴 ∈ V)

Syntax hints:   → wi 4   ∈ wcel 1393  Vcvv 2557   class class class wbr 3764  Rel wrel 4350

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-14 1405  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022  ax-sep 3875  ax-pow 3927  ax-pr 3944

This theorem depends on definitions:  df-bi 110  df-3an 887  df-tru 1246  df-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-ral 2311  df-rex 2312  df-v 2559  df-un 2922  df-in 2924  df-ss 2931  df-pw 3361  df-sn 3381  df-pr 3382  df-op 3384  df-br 3765  df-opab 3819  df-xp 4351  df-rel 4352

This theorem is referenced by:  nprrel  4386  vtoclr  4388  opeliunxp2  4476  ideqg  4487  issetid  4490  fvmptss2  5247  brtpos2  5866  brdomg  6229  isfi  6241  en1uniel  6284  xpdom2  6305  xpdom1g  6307  climcl  9803  climi  9808  climrecl  9844