"book-pflow-xyz/chapters/appendix-d-glossary.md" . . "The matrix $\\mathbf{C} = \\mathbf{C}^+ - \\mathbf{C}^-$ where $\\mathbf{C}^+$ is the output matrix (tokens produced) and $\\mathbf{C}^-$ is the input matrix (tokens consumed). Each column represents a transition; each row represents a place. The entry $\\mathbf{C}_{ij}$ is the net change in place $i$ when transition $j$ fires (Chapter 2)."@en . . "Incidence matrix"@en . "2"^^ .