Theorem slmd0vlid

Description: Left identity law for the zero vector. ( hvaddid2 analog.) (Contributed by NM, 10-Jan-2014) (Revised by Mario Carneiro, 19-Jun-2014) (Revised by Thierry Arnoux, 1-Apr-2018)

	Ref	Expression
Hypotheses	slmd0vlid.v	$$⊢V={\mathrm{Base}}_W$$
	slmd0vlid.a	$$⊢\underset{\dot{}}{+}={+}_W$$
	slmd0vlid.z	$$⊢\underset{\dot{}}{0}=0_W$$
Assertion	slmd0vlid	$$⊢\left(W\in \mathrm{SLMod}\wedge X\in V\right)\to \underset{\dot{}}{0}\underset{\dot{}}{+}X=X$$

Proof

Step	Hyp	Ref	Expression
1		slmd0vlid.v	$$⊢V={\mathrm{Base}}_W$$
2		slmd0vlid.a	$$⊢\underset{\dot{}}{+}={+}_W$$
3		slmd0vlid.z	$$⊢\underset{\dot{}}{0}=0_W$$
4		slmdmnd	$$⊢W\in \mathrm{SLMod}\to W\in \mathrm{Mnd}$$
5	1 2 3	mndlid	$$⊢\left(W\in \mathrm{Mnd}\wedge X\in V\right)\to \underset{\dot{}}{0}\underset{\dot{}}{+}X=X$$
6	4 5	sylan	$$⊢\left(W\in \mathrm{SLMod}\wedge X\in V\right)\to \underset{\dot{}}{0}\underset{\dot{}}{+}X=X$$