Theorem releldmi 4901

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 4897	. 2 |- ( ( Rel R /\ A R B ) -> A e. dom R )
3	1, 2	mpan 424	1 |- ( A R B -> A e. dom R )

Syntax hints:   -> wi 4   e. wcel 2164   class class class wbr 4029   dom cdm 4659   Rel wrel 4664

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 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-14 2167  ax-ext 2175  ax-sep 4147  ax-pow 4203  ax-pr 4238

This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1472  df-sb 1774  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ral 2477  df-rex 2478  df-v 2762  df-un 3157  df-in 3159  df-ss 3166  df-pw 3603  df-sn 3624  df-pr 3625  df-op 3627  df-br 4030  df-opab 4091  df-xp 4665  df-rel 4666  df-dm 4669

This theorem is referenced by:  iserex  11482  climrecvg1n  11491  climcvg1nlem  11492  fsum3cvg3  11539  trirecip  11644