Theorem lmodvsass

Description: In a module, scalar multiplication is a semigroup action. ( ax-hvmulass analog.) (Contributed by NM, 10-Jan-2014) (Revised by Mario Carneiro, 22-Sep-2015)

	Ref	Expression
Hypotheses	lmodvsass.v	$$⊢V={\mathrm{Base}}_W$$
	lmodvsass.f	$$⊢F=\mathrm{Scalar}\left(W\right)$$
	lmodvsass.s	$$⊢\underset{\dot{}}{·}={\cdot }_W$$
	lmodvsass.k	$$⊢K={\mathrm{Base}}_F$$
	lmodvsass.t	$$⊢\underset{\dot{}}{\times }={\cdot }_F$$
Assertion	lmodvsass	$$⊢\left(W\in \mathrm{LMod}\wedge \left(Q\in K\wedge R\in K\wedge X\in V\right)\right)\to \left(Q\underset{\dot{}}{\times }R\right)\underset{\dot{}}{·}X=Q\underset{\dot{}}{·}\left(R\underset{\dot{}}{·}X\right)$$

Proof

Step	Hyp	Ref	Expression
1		lmodvsass.v	$$⊢V={\mathrm{Base}}_W$$
2		lmodvsass.f	$$⊢F=\mathrm{Scalar}\left(W\right)$$
3		lmodvsass.s	$$⊢\underset{\dot{}}{·}={\cdot }_W$$
4		lmodvsass.k	$$⊢K={\mathrm{Base}}_F$$
5		lmodvsass.t	$$⊢\underset{\dot{}}{\times }={\cdot }_F$$
6		eqid	$$⊢{+}_W={+}_W$$
7		eqid	$$⊢{+}_F={+}_F$$
8		eqid	$$⊢1_F=1_F$$
9	1 6 3 2 4 7 5 8	lmodlema	$$⊢\left(W\in \mathrm{LMod}\wedge \left(Q\in K\wedge R\in K\right)\wedge \left(X\in V\wedge X\in V\right)\right)\to \left(\left(R\underset{\dot{}}{·}X\in V\wedge R\underset{\dot{}}{·}\left(X{+}_{W}X\right)=\left(R\underset{\dot{}}{·}X\right){+}_W\left(R\underset{\dot{}}{·}X\right)\wedge \left(Q{+}_{F}R\right)\underset{\dot{}}{·}X=\left(Q\underset{\dot{}}{·}X\right){+}_W\left(R\underset{\dot{}}{·}X\right)\right)\wedge \left(\left(Q\underset{\dot{}}{\times }R\right)\underset{\dot{}}{·}X=Q\underset{\dot{}}{·}\left(R\underset{\dot{}}{·}X\right)\wedge 1_F\underset{\dot{}}{·}X=X\right)\right)$$
10	9	simprld	$$⊢\left(W\in \mathrm{LMod}\wedge \left(Q\in K\wedge R\in K\right)\wedge \left(X\in V\wedge X\in V\right)\right)\to \left(Q\underset{\dot{}}{\times }R\right)\underset{\dot{}}{·}X=Q\underset{\dot{}}{·}\left(R\underset{\dot{}}{·}X\right)$$
11	10	3expa	$$⊢\left(\left(W\in \mathrm{LMod}\wedge \left(Q\in K\wedge R\in K\right)\right)\wedge \left(X\in V\wedge X\in V\right)\right)\to \left(Q\underset{\dot{}}{\times }R\right)\underset{\dot{}}{·}X=Q\underset{\dot{}}{·}\left(R\underset{\dot{}}{·}X\right)$$
12	11	anabsan2	$$⊢\left(\left(W\in \mathrm{LMod}\wedge \left(Q\in K\wedge R\in K\right)\right)\wedge X\in V\right)\to \left(Q\underset{\dot{}}{\times }R\right)\underset{\dot{}}{·}X=Q\underset{\dot{}}{·}\left(R\underset{\dot{}}{·}X\right)$$
13	12	exp42	$$⊢W\in \mathrm{LMod}\to \left(Q\in K\to \left(R\in K\to \left(X\in V\to \left(Q\underset{\dot{}}{\times }R\right)\underset{\dot{}}{·}X=Q\underset{\dot{}}{·}\left(R\underset{\dot{}}{·}X\right)\right)\right)\right)$$
14	13	3imp2	$$⊢\left(W\in \mathrm{LMod}\wedge \left(Q\in K\wedge R\in K\wedge X\in V\right)\right)\to \left(Q\underset{\dot{}}{\times }R\right)\underset{\dot{}}{·}X=Q\underset{\dot{}}{·}\left(R\underset{\dot{}}{·}X\right)$$