Grid bracing: https://en.wikipedia.org/wiki/Grid_bracing
This is a mathematical abstraction of problems of making a grid-like structure rigid by adding cross-bracing, of a type that should be familiar to anyone who has played with building blocks, built houses of cards, or tried to assemble a backless bookshelf. It forms a bridge between combinatorics and structural engineering in providing a solution to these problems based purely on graph connectivity analysis rather than numerical simulation.
Now a Good Article on Wikipedia.
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