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Theorem lssex 14663
Description: Existence of a linear subspace. (Contributed by Jim Kingdon, 27-Apr-2025.)
Assertion
Ref Expression
lssex  |-  ( W  e.  V  ->  ( LSubSp `
 W )  e. 
_V )

Proof of Theorem lssex
Dummy variables  w  a  b  j  s  x are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 basfn 13389 . . . . . 6  |-  Base  Fn  _V
2 vex 2824 . . . . . . 7  |-  w  e. 
_V
32a1i 9 . . . . . 6  |-  ( W  e.  V  ->  w  e.  _V )
4 funfvex 5707 . . . . . . 7  |-  ( ( Fun  Base  /\  w  e.  dom  Base )  ->  ( Base `  w )  e. 
_V )
54funfni 5478 . . . . . 6  |-  ( (
Base  Fn  _V  /\  w  e.  _V )  ->  ( Base `  w )  e. 
_V )
61, 3, 5sylancr 418 . . . . 5  |-  ( W  e.  V  ->  ( Base `  w )  e. 
_V )
76pwexd 4313 . . . 4  |-  ( W  e.  V  ->  ~P ( Base `  w )  e.  _V )
8 rabexg 4274 . . . 4  |-  ( ~P ( Base `  w
)  e.  _V  ->  { s  e.  ~P ( Base `  w )  |  ( E. j  j  e.  s  /\  A. x  e.  ( Base `  (Scalar `  w )
) A. a  e.  s  A. b  e.  s  ( ( x ( .s `  w
) a ) ( +g  `  w ) b )  e.  s ) }  e.  _V )
97, 8syl 14 . . 3  |-  ( W  e.  V  ->  { s  e.  ~P ( Base `  w )  |  ( E. j  j  e.  s  /\  A. x  e.  ( Base `  (Scalar `  w ) ) A. a  e.  s  A. b  e.  s  (
( x ( .s
`  w ) a ) ( +g  `  w
) b )  e.  s ) }  e.  _V )
109alrimiv 1927 . 2  |-  ( W  e.  V  ->  A. w { s  e.  ~P ( Base `  w )  |  ( E. j 
j  e.  s  /\  A. x  e.  ( Base `  (Scalar `  w )
) A. a  e.  s  A. b  e.  s  ( ( x ( .s `  w
) a ) ( +g  `  w ) b )  e.  s ) }  e.  _V )
11 df-lssm 14662 . . 3  |-  LSubSp  =  ( w  e.  _V  |->  { s  e.  ~P ( Base `  w )  |  ( E. j  j  e.  s  /\  A. x  e.  ( Base `  (Scalar `  w )
) A. a  e.  s  A. b  e.  s  ( ( x ( .s `  w
) a ) ( +g  `  w ) b )  e.  s ) } )
1211mptfvex 5785 . 2  |-  ( ( A. w { s  e.  ~P ( Base `  w )  |  ( E. j  j  e.  s  /\  A. x  e.  ( Base `  (Scalar `  w ) ) A. a  e.  s  A. b  e.  s  (
( x ( .s
`  w ) a ) ( +g  `  w
) b )  e.  s ) }  e.  _V  /\  W  e.  V
)  ->  ( LSubSp `  W )  e.  _V )
1310, 12mpancom 426 1  |-  ( W  e.  V  ->  ( LSubSp `
 W )  e. 
_V )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104   A.wal 1400   E.wex 1545    e. wcel 2209   A.wral 2528   {crab 2532   _Vcvv 2821   ~Pcpw 3685    Fn wfn 5367   ` cfv 5372  (class class class)co 6075   Basecbs 13330   +g cplusg 13408  Scalarcsca 13411   .scvsca 13412   LSubSpclss 14661
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  ax-un 4573  ax-cnex 8260  ax-resscn 8261  ax-1re 8263  ax-addrcl 8266
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-int 3966  df-br 4126  df-opab 4188  df-mpt 4189  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-iota 5332  df-fun 5374  df-fn 5375  df-fv 5380  df-inn 9284  df-ndx 13333  df-slot 13334  df-base 13336  df-lssm 14662
This theorem is referenced by:  lidlex  14782
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