Systematic modification of manifolds by replacing Sᵏ×Dⁿ⁻ᵏ with Dᵏ⁺¹×Sⁿ⁻ᵏ⁻¹. Classifies manifolds up to h-cobordism; Browder-Novikov-Sullivan-Wall.
Systematic modification of manifolds by replacing Sᵏ×Dⁿ⁻ᵏ with Dᵏ⁺¹×Sⁿ⁻ᵏ⁻¹. Classifies manifolds up to h-cobordism; Browder-Novikov-Sullivan-Wall.