Theorem lcomf 18902

Description: A linear-combination sum is a function. (Contributed by Stefan O'Rear, 28-Feb-2015.)

Hypotheses

Ref	Expression
lcomf.f	|- F = (Scalar ` W )
lcomf.k	|- K = ( Base ` F )
lcomf.s	|- .x. = ( .s ` W )
lcomf.b	|- B = ( Base ` W )
lcomf.w	|- ( ph -> W e. LMod )
lcomf.g	|- ( ph -> G : I --> K )
lcomf.h	|- ( ph -> H : I --> B )
lcomf.i	|- ( ph -> I e. V )

Assertion

Ref	Expression
lcomf	|- ( ph -> ( G oF .x. H ) : I --> B )

Proof of Theorem lcomf

Dummy variables x y are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		lcomf.w	. . 3 |- ( ph -> W e. LMod )
2		lcomf.b	. . . . 5 |- B = ( Base ` W )
3		lcomf.f	. . . . 5 |- F = (Scalar ` W )
4		lcomf.s	. . . . 5 |- .x. = ( .s ` W )
5		lcomf.k	. . . . 5 |- K = ( Base ` F )
6	2, 3, 4, 5	lmodvscl 18880	. . . 4 |- ( ( W e. LMod /\ x e. K /\ y e. B ) -> ( x .x. y ) e. B )
7	6	3expb 1266	. . 3 |- ( ( W e. LMod /\ ( x e. K /\ y e. B ) ) -> ( x .x. y ) e. B )
8	1, 7	sylan 488	. 2 |- ( ( ph /\ ( x e. K /\ y e. B ) ) -> ( x .x. y ) e. B )
9		lcomf.g	. 2 |- ( ph -> G : I --> K )
10		lcomf.h	. 2 |- ( ph -> H : I --> B )
11		lcomf.i	. 2 |- ( ph -> I e. V )
12		inidm 3822	. 2 |- ( I i^i I ) = I
13	8, 9, 10, 11, 11, 12	off 6912	1 |- ( ph -> ( G oF .x. H ) : I --> B )

Syntax hints:   -> wi 4   /\ wa 384   = wceq 1483   e. wcel 1990   -->wf 5884   ` cfv 5888  (class class class)co 6650   oFcof 6895   Basecbs 15857  Scalarcsca 15944   .scvsca 15945   LModclmod 18863

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pr 4906

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-of 6897  df-lmod 18865

This theorem is referenced by:  lcomfsupp  18903  frlmup2  20138  islindf4  20177