Graph theory. For the longest time I thought it is an interesting and even beautiful branch of mathematics but somewhat "recreational" and disconnected from my

Graph theory. For the longest time I thought it is an interesting and even beautiful branch of mathematics but somewhat "recreational" and disconnected from my various bread-and butter workhorses for applied work (from linear algebra and PDE's to differential geometry etc). So I never bothered to dig and connect the dots. At some point I realised the connections between the two worlds e.g., graph operations as linear algebra [0] or the transition from continuous Laplacian to graph Laplacian via a discrete Laplace operator [1] [0] https://graphblas.org/ https://graphblas.org/ [1] https://en.wikipedia.org/wiki/Discrete_Laplace_operator https://en.wikipedia.org/wiki/Discrete_Laplace_operator