https://wbricken.com/htmls/01bm/01-math.html > *Boundary mathematics* is the study of the representation and transformation of non-textual formal systems, including diagrammatic (2D), spatial (3D), iconic (pictorial) and other systems not expressed by strings of tokens. > > *Boundary logic* amplifies Spencer-Brown's "contentless" book, Laws of Form. Boundary math (including logic, numerics, imaginaries, ...) leads to a diversity of new notational systems with new transformational properties. Here is a very short introduction to the mathematics: