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Theorem lssex 13663
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 12565 . . . . . 6  |-  Base  Fn  _V
2 vex 2755 . . . . . . 7  |-  w  e. 
_V
32a1i 9 . . . . . 6  |-  ( W  e.  V  ->  w  e.  _V )
4 funfvex 5548 . . . . . . 7  |-  ( ( Fun  Base  /\  w  e.  dom  Base )  ->  ( Base `  w )  e. 
_V )
54funfni 5332 . . . . . 6  |-  ( (
Base  Fn  _V  /\  w  e.  _V )  ->  ( Base `  w )  e. 
_V )
61, 3, 5sylancr 414 . . . . 5  |-  ( W  e.  V  ->  ( Base `  w )  e. 
_V )
76pwexd 4196 . . . 4  |-  ( W  e.  V  ->  ~P ( Base `  w )  e.  _V )
8 rabexg 4161 . . . 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 1885 . 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 13662 . . 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 5618 . 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 422 1  |-  ( W  e.  V  ->  ( LSubSp `
 W )  e. 
_V )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104   A.wal 1362   E.wex 1503    e. wcel 2160   A.wral 2468   {crab 2472   _Vcvv 2752   ~Pcpw 3590    Fn wfn 5227   ` cfv 5232  (class class class)co 5892   Basecbs 12507   +g cplusg 12582  Scalarcsca 12585   .scvsca 12586   LSubSpclss 13661
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-13 2162  ax-14 2163  ax-ext 2171  ax-sep 4136  ax-pow 4189  ax-pr 4224  ax-un 4448  ax-cnex 7927  ax-resscn 7928  ax-1re 7930  ax-addrcl 7933
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1472  df-sb 1774  df-eu 2041  df-mo 2042  df-clab 2176  df-cleq 2182  df-clel 2185  df-nfc 2321  df-ral 2473  df-rex 2474  df-rab 2477  df-v 2754  df-sbc 2978  df-csb 3073  df-un 3148  df-in 3150  df-ss 3157  df-pw 3592  df-sn 3613  df-pr 3614  df-op 3616  df-uni 3825  df-int 3860  df-br 4019  df-opab 4080  df-mpt 4081  df-id 4308  df-xp 4647  df-rel 4648  df-cnv 4649  df-co 4650  df-dm 4651  df-rn 4652  df-res 4653  df-iota 5193  df-fun 5234  df-fn 5235  df-fv 5240  df-inn 8945  df-ndx 12510  df-slot 12511  df-base 12513  df-lssm 13662
This theorem is referenced by:  lidlex  13782
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