It is just like the linear algebra over communtativecommutative ring (maybe advanced linear algebra),that that is a nature extension and can make the structure of Lie algebra more algebraic,but but I find little book discussing this topic.
I just know Weibei’sWeibel’s book “Homological Algebra” discuss something,butsomething, but that is just a form,do do not pay more attention to the Lie algebra and show some difference between field coefficient and ring coefficient.
Does anybody know something else?