Info : T is actually a triangulation -list of triangles-, in which each index corresponding to the row index of a vertex in another list -a vertices list-, it is a widely used technique used to store and write triangular meshes in mesh processing. Here below the example is a tetrahedron -4 facets-.
Extract leading non-zero digit
Find common elements in matrix rows
fly fly away
Back to basics 1 - Saving
MatCAT - Reconstruct X from Its X-rays
Query a vertex neighbors
Remove duplicated triangles
Find a common vertex
Find a common edge
Query every vertices neighbor indices
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