In social network analysis and mathematical sociology, interpersonal ties are defined as information-carrying connections between people. Interpersonal ties, generally, come in three varieties: strong
Friends, painting by Hanna Pauli
Mathematical Bridge, or officially Wooden Bridge, is an arch bridge in Cambridge, United Kingdom. The arrangement of timbers is a series of tangents that describe the arc of the bridge, with radial members to tie the tangents together and triangulate the structure, making it rigid and self-supporting.