Two examples, Swipe!

(image caroussel)

Een matrixtree ('tree') is a tree structure, written on a roster, the grid.

Each node coincides with a crossing of two grid lines.

Each such node is the only one on these two gridlines.

Process

Given the Matrix Notation, note that both matrix trees must be the result of a process.

In the  PRE tree, the R-node was rendered in the first free position available. Evidently, this happened after rendering the first node, P.

In the REP-tree, R was rendered first, followed by E, followed by P.

So, given the notation, there is an order, a sequence in "firing" the production rules.

Nice!