Quasicontraction semigroup


In mathematical analysis, a C0-semigroup Γ, t ≥ 0, is called a quasicontraction semigroup if there is a constant ω such that ||Γ|| ≤ exp for all t ≥ 0. Γ is called a contraction semigroup if ||Γ|| ≤ 1 for all t ≥ 0.