Submersion (mathematics)

In mathematics, particularly in the fields of topology and differential geometry, the term "submersion" refers to a specific type of smooth map between differentiable manifolds. A smooth map \( f: M \to N \) is called a submersion at a point \( p \in M \) if its differential \( df_p: T_pM \to T_{f(p)}N \) is surjective.