All pages ("nodes") in Knowen belong to a directed acyclic graph: more
general nodes are to the left (upstream), and more specific to the right (downstream).
Hover over a node to see the node preview; click to select a specific node;
mouse scroll to zoom; click and drag to move.
A set of vectors is linearly independent if and only if the homogeneous linear system corresponding to the matrix of column vectors has only the trivial solution.