Theorem lssex 14367

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.

Step	Hyp	Ref	Expression
1		basfn 13140	. . . . . 6 |- Base Fn _V
2		vex 2805	. . . . . . 7 |- w e. _V
3	2	a1i 9	. . . . . 6 |- ( W e. V -> w e. _V )
4		funfvex 5656	. . . . . . 7 |- ( ( Fun Base /\ w e. dom Base ) -> ( Base ` w ) e. _V )
5	4	funfni 5432	. . . . . 6 |- ( ( Base Fn _V /\ w e. _V ) -> ( Base ` w ) e. _V )
6	1, 3, 5	sylancr 414	. . . . 5 |- ( W e. V -> ( Base ` w ) e. _V )
7	6	pwexd 4271	. . . 4 |- ( W e. V -> ~P ( Base ` w ) e. _V )
8		rabexg 4233	. . . 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 )
9	7, 8	syl 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 )
10	9	alrimiv 1922	. 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 14366	. . 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 ) } )
12	11	mptfvex 5732	. 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 )
13	10, 12	mpancom 422	1 |- ( W e. V -> ( LSubSp ` W ) e. _V )

Syntax hints:   -> wi 4   /\ wa 104   A.wal 1395   E.wex 1540   e. wcel 2202   A.wral 2510   {crab 2514   _Vcvv 2802   ~Pcpw 3652   Fn wfn 5321   ` cfv 5326  (class class class)co 6017   Basecbs 13081   +g cplusg 13159  Scalarcsca 13162   .scvsca 13163   LSubSpclss 14365

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 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-pow 4264  ax-pr 4299  ax-un 4530  ax-cnex 8122  ax-resscn 8123  ax-1re 8125  ax-addrcl 8128

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-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-iota 5286  df-fun 5328  df-fn 5329  df-fv 5334  df-inn 9143  df-ndx 13084  df-slot 13085  df-base 13087  df-lssm 14366

This theorem is referenced by:  lidlex  14486