KnowraBaker–Campbell–Hausdorff formulaLinked fromLinked fromThe 4 pages that link to Baker–Campbell–Hausdorff formula, each with the reason it gives.All 4Related 4Lie algebraRelated: It relates multiplication of nearby group elements to the Lie bracket.Matrix exponentialRelated: It quantifies why exp(A)exp(B) differs from exp(A+B) when A and B do not commute.Lie's third theoremRelated: It gives a local multiplication law from bracket data, complementing the theorem's global existence.Lie product formulaRelated: It exposes the commutator corrections behind finite-step product errors.