Thanks, I didn't mean to offend. Which is the best starting point? Based on the blog post I was hoping to get some introduction by way of familiar concepts such

Thanks, I didn't mean to offend. Which is the best starting point? Based on the blog post I was hoping to get some introduction by way of familiar concepts such as linear algebra and homomorphism, before confronting applications to theoretical computer science. Anyway, is the best starting point "Diagrammatic Algebra: From Linear to Concurrent Systems" or "The Calculus of Signal Flow Diagrams I: Linear relations on streams" or something else?