Theorem releldmi 5016

Description: The first argument of a binary relation belongs to its domain. (Contributed by NM, 28-Apr-2015.)

Hypothesis

Ref	Expression
releldm.1	|- Rel R

Assertion

Ref	Expression
releldmi	|- ( A R B -> A e. dom R )

Proof of Theorem releldmi

Step	Hyp	Ref	Expression
1		releldm.1	. 2 |- Rel R
2		releldm 5012	. 2 |- ( ( Rel R /\ A R B ) -> A e. dom R )
3	1, 2	mpan 428	1 |- ( A R B -> A e. dom R )

Syntax hints:   -> wi 4   e. wcel 2209   class class class wbr 4125   dom cdm 4769   Rel wrel 4774

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-br 4126  df-opab 4188  df-xp 4775  df-rel 4776  df-dm 4779

This theorem is referenced by:  iserex  12083  climrecvg1n  12092  climcvg1nlem  12093  fsum3cvg3  12141  trirecip  12246