what is e-embedding techniques used for separation of slow and fast variables?please provide some books or papers which has clear explanations in this topic
DO you mean in differential equations? if you mean this, there are a lot of resource, but the old and famous one, is Landau book on classical mechanics.
thank you Azizi for your valuable reply . They are using this techniue for timescale separation of uncertainities in power system applications. For eg:, say delP(uncertainity) = Ep*Xp
where Ep = perturbation matrix
Xp= states of system
so i need general help regarding how perturbation matrix can be formed from state equations