deformation theory
branch of mathematics studying infinitesimal conditions associated with varying a solution 𝑃 of a problem to slightly different solutions 𝑃_𝜀, where 𝜀 is a small number or vector
branch of mathematics studying infinitesimal conditions associated with varying a solution 𝑃 of a problem to slightly different solutions 𝑃_𝜀, where 𝜀 is a small number or vector