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Theorem dom1oi 7002
Description: A set with an element dominates one. (Contributed by Jim Kingdon, 3-Feb-2026.)
Assertion
Ref Expression
dom1oi  |-  ( ( A  e.  V  /\  B  e.  A )  ->  1o  ~<_  A )

Proof of Theorem dom1oi
Dummy variable  j is distinct from all other variables.
StepHypRef Expression
1 elex2 2819 . . 3  |-  ( B  e.  A  ->  E. j 
j  e.  A )
21adantl 277 . 2  |-  ( ( A  e.  V  /\  B  e.  A )  ->  E. j  j  e.  A )
3 dom1o 7001 . . 3  |-  ( A  e.  V  ->  ( 1o 
~<_  A  <->  E. j  j  e.  A ) )
43adantr 276 . 2  |-  ( ( A  e.  V  /\  B  e.  A )  ->  ( 1o  ~<_  A  <->  E. j 
j  e.  A ) )
52, 4mpbird 167 1  |-  ( ( A  e.  V  /\  B  e.  A )  ->  1o  ~<_  A )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    <-> wb 105   E.wex 1540    e. wcel 2202   class class class wbr 4088   1oc1o 6574    ~<_ cdom 6907
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-in1 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-nul 4215  ax-pow 4264  ax-pr 4299  ax-un 4530
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-v 2804  df-sbc 3032  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-id 4390  df-suc 4468  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-1o 6581  df-dom 6910
This theorem is referenced by:  wlk1walkdom  16209
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